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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