高等继续教育 / 专科英语I
正确率：100%
题型描述: 单选题
It’s essential that these application forms _ _ _ _ _ _ back as early as possible.
A. are sent
B. be sent
C. will be sent
D. must be sent
It’s essential that these application forms _ _ _ _ _ _ back as early as possible.
A. are sent
B. be sent
C. will be sent
D. must be sent
参考答案：