It is imperative that the students ______ to hand in their papers on time.

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问题 It is imperative that the students  ______  to hand in their papers on time.

选项 A、told
B、be told
C、are told
D、have been told

答案B

解析 在It is imperative that...的句型中,从句里只能使用虚拟语气的情态动词should,也可以省略 should。之所以选B,是因为省略了should。选项A不能用,是因为tell是及物动词,后面没有宾语,又不能加动词不定式做宾语。
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