摘要： It is essential that these application forms back as early as possible. A. must be sent B. are sen C. will be sent D. be sent
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It is essential that these application forms ______ back as early as possible.
|
A．must be sent |
B．will be sent |
C．are sent |
D．be sent |
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It is essential that these application forms ______ back as early as possible.
| A．must be sent | B．will be sent | C．are sent | D．be sent |