让步状语从句 填空He tired his best to solve the problem,__difficult

我觉得选A
D in spite of肯定不行，of是个介词，后面不能直接接个句子
C despite一样是个介词，直接加句子不行
B no matter how后面要接形容词，不管多怎么样...如果用的话应该这样：no matter how good the TV program is。。。。

though 引导的让步状语从句可用部分倒装的形式(注意：倒装后位于句首的名词之前不用冠词)：
Poor though I am,I can afford it.我虽穷,但这东西还是买得起的.
Child though he was,he did quite well.他虽是孩子,但干得很好.
Bravely though they fought,they had no chance of winning.
虽然他们打得很勇敢,但还是没有机会获胜.

不可以 已经有代词了
whether
conj.
1.(引导名词从句)是否
Ask him whether he can come or not.
问问他是否能来.
I don't know whether you like flowers,sir.
先生,我不知道您是否喜欢花.
2.(与or连用,引导状语从句)不管是...(或是)
We'll go on with the work,whether we can find the necessary tools or not.
不管我们能否找到所需的工具,我们要把这件工作做下去.
在引导定语从句时,一般情况下whether和if都可使用,但whether的适用范围要比if广,实在不知道应用什么的时候,选whether.
例如从句若出现了选择项：A or B,只能用whether而不能用if
但要注意,从句为否定句是,只能用if,而不能用whether
pron.
1.【古】(两个中的)哪一个,任一个
引导名词性从句的关联词
连接词that,whether,if
1.whether ,if 本身有意义,不能省略
2.whether 可以做介词宾语 if不能
3.whether 引导的句子可以放在复合句的句首,连接宾语从句时,whether和if可以互换
4.whether 后可接不定式
5.whether or no意为 无论如何,不管 ,不可说 if or no
6.动词wonder 可以接if,whether 从句,也可以接that 从句
7.doubt 的肯定句接if,whether从句
8.if,whether常用在see,ask,try,wonder,know等动词后
9.可以说 no matter whether 或 no matter if
ok,希望以上某一条对你有用!
whether和if都可以引导宾语从句,表示“是否”,在口语或间接引语中两者可以互换使用.如：
I wonder if / whether I can get some advice from you.
Ask him whether / if he can come.
但在有些情况下,whether和if的用法有一定区别.
1.whether引导的从句常可以与连词or或or not直接连用,而if一般不能.如：
正：Let me know whether you can come or not.
误：Let me know if you can come or not.
2.当宾语从句提到句首时,只能用whether引导,而不能用if.如：
正：Whether it is true or not,I can’t tell.
误：If it is true or not,I can’t tell.
3.whether可以引导带to的不定式,if则不能.如：
正：I don’t know whether to accept or refuse.
误：I don’t know if to accept or refuse.
4.whether及其引导的成分可放于介词之后,作介词的宾语,但if不能.如：
正：I worry about whether I hurt her feelings.
误：I worry about if I hurt her feelings.
5.whether可以引导从句,作主语、表语或同位语,而if不能.如：
正：It was uncertain whether he would come.
误：It was uncertain if he would come.
正：His first question was whether Tom had arrived yet.
误：His first question was if Tom had arrived yet.
正：We must consider the question whether we will take these measures.
误：We must consider the question if we will take these measures.

正确 !
as 引导让步状语从句时,as不能放在句首,因此常把从句中的某一部分提到句首,
如把可数名词单数提到句首时,名词前的a/an要省略.如:
Child as he is ,he can look after himself .
=Although he is a child ,he can look after himself .
虽然他是个孩子,但是他能照顾自己.
因此你这个从句是正确的.
Child of the boss as he is ...虽然他是老板的孩子.

Much as she liked him,she still can't get married with him
这种句型是
【形容词/副词/名词+as/though+主语+|谓语,...】表示虽然...
形容词的就不举例了,举个名词的
Child as he was,he can do such difficult problems
虽然他只是一个孩子,但是他能做出如此才难的题目
有不会的可以再问我

as引导让步状语从句,从句部分用倒装.
形容词/分词 /副词 / 动词/名词（无冠词）+ as +that+主语+谓语.
动词前置时,从句主语后要用may,might,can,could,will,would等情态动词.若前置动词是及物动词,则其宾语也随其后一同提前.
Try as he may,he never succeeds.
尽管他很努力,但他从未成功.
Change your mind as you will,you will get no help from us.
即使你改变主意,你也不会得到我们的帮助.

he didn't listen to he

Though she is poor,she is honest.
as引导让步状语从句(倒装):
Poor as she is,she is honest.

Sea as i was interested in there is nothing i can do but wait now.这个句子是错误的.以as,though引导的让步状语从句多用倒装语序,即把在从句中作表语的名词、形容词,或修饰谓语动词的副词放在从句谓语之前.当作...

1.I was about to go to bed when I heard someone knock at the door.2.You would let your children play where you can see them.3.I was not kind to him when he was rude.4.If anything important happens,please call me up.5.In order that he could catch the bus,he got up early.6.He went out,though it was raining.7.His brother is as handsome as he (is).8.He stood up as if (he wanted ) to leave.9.It’s so good a book that I’ve read it again and again.

引导让步状语从句的从属连词.主要的有although,though,even though,even if,while,however,whatever,whoever,whenever,wherever等.如：
Although [Though] he is poor,he is well contented.他虽穷却能知足常乐.
Though [Even though] it’s hard work,I enjoy it.尽管是苦活,但我乐意干.
Even if you don't like wine,try a glass of this.即使你不喜欢渴酒,也尝尝这杯吧.
While we don’t agree we continue to be friends.尽管我们意见不同,但我们还是朋友.
However you use it,it won’t break.不管你怎么使用,它都不会破.
Whatever you say,I believe you.无论你说什么,我都相信你.
Whoever telephones,tell them I'm out.不管是谁打电话,都说我出去了.
Whenever you come,you are welcome.你什么时候来,我们都欢迎.
However much he eats,he never gets fat.无论他吃多少,他都不发胖.

although / though / no matter +疑问词( 疑问词+ever) :：引导让步状语从句
1.Although/ Though he is young , he can help do a lot of housework
---Young as / though he is, he can help do a lot of housework
---Child as/though he is , he can help do a lot of housework
2.However difficult (=No matter how difficult ) it is , we may finish it in time.

whatever 和 no matter what 在基本词义上是一致的,都是无论什么的意思.
但是 whatever 和 no matter what 区别就是 whatever 可以充当名词成分（比如主语,宾语等）.而 no matter what 不行,它只能引导让步状语从句.