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 句型It is imperative that…+V(动词原形)…表示“……是必须的”,句意为学生必须按时上交他们的学期论文。因此正确答案为A。
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