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以it开头的句子的类型

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以it开头的句子的类型
有四类,求例句和分析,
1) It was last night ___ I see the comet.
A.the time B.when C.that D.which
答案C.强调句的结构是:It +be +强调部分 + that (who) + 主谓句.强调句的连词只有两个,that和who.当强调的部分是人,且为句子的主语时,才用 "who",其余用that.
原句:My father did the experiment in the lab yesterday evening.
强调主语:It was my father who did the experiment in the lab yesterday evening.
强调宾语:It was the experiment that my father did in the lab yesterday evening.
强调时间:It was yesterday evening that my father did the experiment in the lab.(注意不用when)
强调地点:It was in the lab that my father did the experiment yesterday evening.
2)It is ten years ___ Miss Green returned to Canada.
A.that B.when C.since D.as
答案C.考点是连词用法.本题易误选为A.that.其实本句不是强调句.若是,去掉It be… that还应是一个完整的句子.而本句去掉 'It is…that',只剩下ten years Miss Green returned to Canada.不成句.因此本句不是强调句.
It is /was +时间+ since… 其中is has been was had been.