It is (was) 被强调部分+ that (who) + 句子其他部分。 此结构强调的成分仅限于主语,宾语和状语。 It is from the sun that we get light and heat. It was not until I had read your letter that I understood the true state of affairs. 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。 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.