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

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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