2. 外语
  3. It was essential that the application forms ______ back hefore the deadline.

It was essential that the application forms ______ back hefore the deadline.

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问题 It was essential that the application forms ______ back hefore the deadline.
选项 A、must be sent
B、would he sere
C、be sent
D、were sent
答案C
解析 本题中有形容词essential，它后面的状语从句要用should+动词原形构成的虚拟语气，类似的形容词还有；important，necessary，natural，urgent， essential，appropriate，vital advisable，possible，pitiful， funny，concerned，ridiculous，anxious，unthinkable等。
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