It was essential that the application forms ________ back before thedeadline.A.must be sentB.would be sentC.be sentD.were sent
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C解析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。