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1）强调句型的强调部分必须是对 that / who 之后句子的某一成分表示强调,如果把 "It is (was)...that "去掉,该句应该意思完整,不缺任何句子成分: 例句： It was Mike and Mary who helped the old man several days ago . 2）强调部分为疑问词时: 例句： Who was it that wanted to see me just now. 3）强调部分为 " not ... until " 句型: 例句： It was not until late in the evening _____ her husband arrived home . A. which B. when C. that D. how 4）复合句中的强调句型 例句： I can't quite remember when it was that you started doing the work . It was in the factory where he once worked that he met his lost brother. 练习： 1. 32.It was 80 years before Christopher Columbus crossed the Atlantic______ Zheng sailed to East Africa A. when B. that C. after D. since(2017重庆) 2. It was not until I came here _____I realized this place was famous for not only its beauty but also its weather. (2017 湖南) A. who B. that C. where D. before | 
