【題目】It was essential that the application forms ___________ back before the deadline .

A. must be sent B. would be sent

C. be sent D. were sent

【答案】C

【解析】

試題分析：考查虛擬語氣。形容詞essential和necessary通常和虛擬語氣連用，虛擬語氣的結(jié)構(gòu)為“should+動(dòng)詞原形”，其中should可以省略。句意：申請表必須在最后期限之前發(fā)回來。根據(jù)句意可知使用被動(dòng)語態(tài)，C項(xiàng)中省略了should。故C正確。

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