It was essential that the application forms______back before the deadline.

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问题 It was essential that the application forms______back before the deadline.

选项 A、must be sent
B、would be sent
C、be sent
D、were sent

答案C

解析本题考查主语从句中虚拟语气的用法。在"It is／was+a．+that clause"形成的主语从句中，如果形容词为advisable，essential，important，necessary等评论性形容词时，that引导的从句应使用“(should+)动词原形”的形式。

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