2. 考研
  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 本题是说这些申请表有必要尽早寄回。该句型为"It is essential+从句"的虚拟语气，从句中 should 可省略。因此D项为正确答案。
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