it was about 100 years ago

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maxifa 共回答了8个问题 | 采纳率: 选A容易解释，但为什么不能选B It was +一段时间 before 这个句型不行在这里？用before的话ago这个词就多余了哦~ 选A是强调句型。如果句中; 1年前

It was about 600 years ago____the first clock with a face an It was about 600 years ago____the first clock with a face and an hour hand was made. shaoyanbingya1年前4: airmean 共回答了23个问题 | 采纳率82.6%

该题为强调句所以应填 that.

我是这么判断强调句的：去掉强调句结构 It + be+ .+that +.,句子结构仍完整（强调句就像马甲一样,脱了之后,里面的衣服仍然完整）

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It was about 15 miles away on the other side of the hills请翻译 It was about 15 miles away on the other side of the hills请翻译一下 jyzdf19671年前6: 214402 共回答了17个问题 | 采纳率100%

到达山的另一边大约要走15英里

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it was about 20000years ago that the Chinese first made pape it was about 20000years ago that the Chinese first made paper 是强调句吗,恢复是什么样 chouchou04171年前2: 娃哈哈ewzi 共回答了18个问题 | 采纳率88.9%

Chinese first made paper是主句,about 20000 years ago是时间状语.
因此恢复应该是：
Chinese first made paper about 20000 years ago.
或About 20000 years ago,Chinese first made pape

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It was about 600 years ago______the first clock with a face It was about 600 years ago______the first clock with a face and an hour hand was made. A.that B.until C.before D.when 这个题选B.说是强调句.我就想知道为什么不能选D.选D可以是时间状语从句啊 kcv0001年前3: 安静的小鹿共回答了22个问题 | 采纳率95.5%

把句中的it was...that去掉,句子不缺任何成分.：the first clock with a face and an hour hand was made about 600 years ago.
如果选when,句子不通顺,about 600 years ago.是由介词构成的时间状语,不能构成状语从句.

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all of this was about more than convenience 中 was about all of this was about more than convenience 中 was about RT liuzhu20091年前1: TTNNLL 共回答了13个问题 | 采纳率92.3%

关于.在这里可以理解为意味着.

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It was about 600 years ago _______ the first clock with a fa It was about 600 years ago _______ the first clock with a face and an hour hand was made. A．that B．until C．before D．when zleehit1年前1: 很free 共回答了20个问题 | 采纳率80%

A

考察句型。该句为强调句，强调句的特点是去掉It was ……that……以后句子结构完成。即，the first clock with a face and an hour hand was made about 600 years ago 句子结构完整。

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It was about 600 years ago____the first clock with a face an It was about 600 years ago____the first clock with a face and an hour hand was made. A.that B.until C.before D.when 很多人问过这道题了,因为它是强调句,所以用it was ...that. 但为什么不能选when呢?我理解句意是：六百年前第一台钟被制造出来.那六百年前是时间,对于时间应该可以用when的啊. gkllll1年前2: 特地去问了共回答了17个问题 | 采纳率94.1%

因为when 要和具体的时间“点”搭配,about 600 years ago是表示从造钟到现在“经过”了多少时间,所以不能用when.
你看下面这句：It was yesterday when he got there.
句中yesterday 表示的是具体的过去的某个时间,而不是从过去到现在经过的“一段时间”所以可以用when

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It was about 600 years ago that the first clock with a face It was about 600 years ago that the first clock with a face and an hour hand was made. 六楼隔壁1年前5: 幻想纯真共回答了18个问题 | 采纳率88.9%

大约600年前,出现了第一个时钟,它只有一个表盘和一根时针.

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It was about 4 a.m.in the middle of the night ____ someonekn It was about 4 a.m.in the middle of the night ____ someoneknocked at our door. A、since B、before C、that D、when 请详解 风花雪月几时休1年前4: 曹亚军共回答了17个问题 | 采纳率88.2%

D正确.
when 意思是“这时”.
整个句子：时间大约是凌晨4点钟,这时有人敲门.
如果是强调句,应该是：
It was at about 4 a.m.in the middle of the night that someone knocked at our door.
原形就是：Someone knocked at our door at about 4 a.m.in the middle of the night.
但是,你的句子里面并没有at这个词,所以不是强调句.
另例：We were having dinner when someone knocked at our door.
意思：我们正在吃饭,这时有人敲门了.

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It was about 600 years ago_______the first clock with a face It was about 600 years ago_______the first clock with a face and an hour hand was made.填什么? mmnn5201100221年前3: 390987962 共回答了19个问题 | 采纳率78.9%

that - 这是典型的强调时间
又如以前的高考题：
It was 3 years ago that he joined the army

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