9. (单选题) It’s essential that the application form ____________ out before the deadline.(本题1.0分) A、 must be sent B、 was sent C、 be sent D、 would be sent

9. (单选题) It’s essential that the application form ____________ out before the deadline.(本题1.0分)
A、 must be sent
B、 was sent
C、 be sent
D、 would be sent

出自：漯河职业技术学院大学英语1(高起专)

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