1.The bunsen Burner is so named that it is thought ( ) by

guans222022-10-04 11:39:543条回答

1.The bunsen Burner is so named that it is thought ( ) by
Robert Bunsen
A.to be invented B.to have been invented
选哪一个?为什么?
2.-Have you guaduated from collage?
-Yes,( )
A.I have been studying French for 4 years.
B.I studied French there for 4 years.
C.I have studied French for 4 years.
A,C有什么区别?过去时里可以有for?选哪一个?

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逍遥银狼共回答了21个问题 | 采纳率90.5%: 1.B
在be thought 后一般有to have (been) done 和表示状态的to do/to be两种不定式形式,to have (been) done 是发生在谓语be thought 之前.如：
He is thought to be an honest boy.
They are thought to have invented the story.
2.B
guaduate是过去的动作,但对现在产生影响,故用现在完成时.
现在完成时的另一种用法是延续性动作从过去开始直到现在,所以 C 是四年前开始study直到现在.该题既然回答是yes(已经毕业),study 不可能持续到现在.study 作为一种持续性动词,答案A 和 C 没有多大区别.
英语里,持续性动作（以及暂时性动作的否定形式）都可以与（for）一短时间连用的,for 常省去（在句首和否定句中一般不省去）.; 1年前

平均nn 共回答了14个问题 | 采纳率78.6%: 同意楼上的; 1年前

anycall5288 共回答了44个问题 | 采纳率: B 。表示已经完成的动作。
B 根据语境，强调在大学里学4年法语。; 1年前

关于Mg在Bunsen burner火中的反应 关于Mg在Bunsen burner火中的反应 如果把一小条Mg放在Bunsen　burner火焰中,Mg会产生耀眼的白色光芒.Mg是和什么物质产生反应的?是Bunsen　burner里碳氢化合物（CH4）和氧产生的二氧化碳(CO2)还是氧气(O2)? 急速决恋1年前1: fans1022 共回答了17个问题 | 采纳率82.4%

MG 和氧气反应产生氧化镁
CH4和O2反应产生CO2

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谁能解释一下Bunsen coefficient的基本概念~ zhangxinsui1年前1: sxde2 共回答了21个问题 | 采纳率85.7%

性质：气体溶解度的一种表示方法,相当于吸收系数,常见于早期的文献中.本森系数的定义为：单位体积的溶剂所吸收的、换算到标准状态(273.15K,0.1MPa)下的气体体积.吸收是在气体分压为0.1MPa和测量温度为T的状态下进行的.

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我怎么就理不顺这个句子?The Bunsen Burner is so named because it is thou 我怎么就理不顺这个句子? The Bunsen Burner is so named because it is thought ______by Robert Bunsen. A.to be invented B.having been invented C.invented D.to have been invented z绵绵1年前3: zhaoyan1026 共回答了18个问题 | 采纳率83.3%

Hi
这样,把这个复合句拆开,先从because分成两大块.because引导一个原因状语从句,前面的就不用管了.it is thought 是一个被动语态,后面可以跟宾语从句也可以跟to do不定式结构（和 it is believed,it is considered 一样）.
故可排除选项B和C.若答案仍选的是D,则说明本句还是要强调发明本森灯这件事发生在前.
原句若省略it is thought,则变为it has been invented.加上 it is thought后则变为 it is thought to have been thought.
不知道我说清楚了没有?

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改错The Bunsen burner is so named because it is thought to be 改错The Bunsen burner is so named because it is thought to be invented bu Robert Bunsen,who was Ger The Bunsen burner is so named because it is thought to be invented bu Robert Bunsen,who was German by birth. yamawly1年前2: jiang2103 共回答了24个问题 | 采纳率79.2%

to be invented-to have been invented

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1.The bunsen Burner is so named that it is thought ( ) by

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