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  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.

admin2009-12-05  49
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 It is+形容词+主语+should do是一种惯用句型，其中should可以省略。句意：告诉学生(即学生被告知)他们必须按时交论文，这件事非常重要。
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