摘要：It is essential that these application forms be sent back as early as possible．这些申请表应尽早地寄回.这是很重要的.
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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 |