It was essential that the application forms ________ back before thedeadline.
A．must be sentB．would be sentC．be sentD．were sent
C
這題考查虛擬語氣的用法：在句型It‘s +adj+that從句中，如果adj是essential，necessary，natural等的話，that從句中用sb should do，should可以省略。句意是：申請書要在截至日期前送回來這是最基本的。選C。
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