2. 外语
  3. It is essential that these application forms ______ back as early as possible.

It is essential that these application forms ______ back as early as possible.

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问题 It is essential that these application forms ______ back as early as possible.
选项 A、must be sent
B、will be sent
C、are sent
D、be sent
答案D
解析 在"It is + essential + that clause”结构中，that从句中的谓语要用虚拟语气。例如：It is essential that he (should) be prepared for this．重要的是他要为此做好准备。It is essential that one (should)keep his promise．一个人信守诺言是很重要的。
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