2. 考研
  3. It is essential that these application forms______back as earlier as possible.

It is essential that these application forms______back as earlier as possible.

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问题 It is essential that these application forms______back as earlier as possible.
选项 A、must be sent
B、will be sent
C、are sent
D、be sent
答案D
解析 题干中的essential要求主语从句用虚拟语气，其谓语部分用“should+动词原形”。
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