2. 外语
  3. It is imperative that students_____their term papers on time.

It is imperative that students_____their term papers on time.

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问题 It is imperative that students_____their term papers on time.
选项 A、hand in
B、would hand in
C、have to hand in
D、handed in
答案A
解析 语法规则。It is imperative／necessary／essential／vital that…此类结构中，从句用should+动词原形，should可是省略。
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