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_____ suddenly occurred to me _____ I had to attend an important meeting in Shanghai the next day.
A.It; whichB.What; that
C.What; whichD.It; that
D

试题分析:考察it作为形式主语。本句指的it是形式主语,真正的主语是后面的that引导的主语从句,that在主语从句中不充当任何成分,只起引导和连接作用。本句中还有固定句式It occur to sb that…某人突然想起某事;句意:我突然想起我明天要去上海参加一个重要的会议。故D正确。
点评:形式主语,顾名思义,即形式上是主语,但实际上不是真正的主语,真正的主语是后面的动词不定式、动名词或主语从句等。如果让后面的动词不定式、动名词或主语从句用作主语,那么在句式上容易造成“头重脚轻”,句式不平衡,故往往用it作形式主语,而把真正的主语放在后面。it在这里没有任何意义。
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