The headmaster requested that all students ______ on time to school.

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问题 The headmaster requested that all students ______ on time to school.

选项 A、be
B、were
C、had to arrive
D、must have to be.

答案A

解析 在虚拟语气结构中,放在动词"suggest/request/order"等后的宾语从句中谓语动词要用"should+动词原形",should可以省略。因此[A]为正确选项。
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