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【题目】The most difficult thing _____ they have to finish their work in 3 hours.

A. to B. is to C. that D. is that

【答案】D

【解析】

句意:最困难的事情是他们必须在三个小时内完成工作。to是一个介词或者是动词不定式的符号;is to是系动词后面跟to短语;that连词,引导从句;is that是系动词is后跟that引导的表语从句。根据句子结构可知,这句话是一个主系表结构,主语是The most difficult thing;is是系动词,后面跟that引导的表语从句。故应选D。

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