It was essential that the application forms back before the deadline. A. must be sent ——青夏教育精英家教网—

摘要： It was essential that the application forms back before the deadline. A. must be sent B. be sent C. would be sent D. were sent

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It was essential that the application forms ________ back before the deadline.

A. must be sent B. would be sent C. be sent D. were sent

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