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

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 在表示“必须、重要、希望”等的形容词advisable，compulsory，crucial，desirable，essential，imperative，important，(im)proper，necessary，preferable，urgent，vital…之后的主语从句中，从句应用should+动词原形，should常省略。另外注意，上述形容词在believe，consider，find，think等动词后做宾补时，其后的宾语从句也应用虚拟语气的这种形式。
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