单项选择题

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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单项选择题
The letter seemed ______ by a child.
A．to have written
B．to write
C．to be writing
D．to have been written
单项选择题
The construction of the second-ring viaduct has been ______ for three months.
A．on the way
B．under way
C．at the way
D．to the way
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