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It is essential that these application forms ________ back as early as possible.A.must be sent B.

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

A.must be sent

B.will be sent

C.are sent

D.be sent

可圈可点用户
2021-03-25 13:18
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答案

D

解析

should be sent省略should

可圈可点用户
2021-03-25 18:18
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