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It was essential that the application forms ________ back before thedeadline.
A.must be sentB.would be sentC.be sentD.were sent
C
这题考查虚拟语气的用法:在句型It‘s +adj+that从句中,如果adj是essential,necessary,natural等的话,that从句中用sb should do,should可以省略。句意是:申请书要在截至日期前送回来这是最基本的。选C。
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