单选题
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
A
B
C
D
【正确答案】
C
【答案解析】
[解析] 重点句型题。在it is essential/neeessary/urgent/important that...句型中，that从句中谓语用(should)动词原形的虚拟语气形式。
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