【題目】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:最困難的事情是他們必須在三個小時內(nèi)完成工作。to是一個介詞或者是動詞不定式的符號;is to是系動詞后面跟to短語;that連詞,引導(dǎo)從句;is that是系動詞is后跟that引導(dǎo)的表語從句。根據(jù)句子結(jié)構(gòu)可知,這句話是一個主系表結(jié)構(gòu),主語是The most difficult thing;is是系動詞,后面跟that引導(dǎo)的表語從句。故應(yīng)選D。

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