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常用的强调句结构是it 引导的句子，结构为It is（was）+ 被强调部分+ that （who） + 句子的其余部分。此结构强调的成分限于主语，宾语和状语。例如： It is from the sun that we get light and heat. 我们是从太阳那儿获取光和热。 It was not until I had read your letter that I understood the true state of affairs. 知道读了你的信，我才知道实际情形。 典型例题 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.再如：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. | 
