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
To our surprise, the stranger ______ to be an old friend of my mother's.
A．turned out


B．turned up
C．set out


D．set up
单项选择题
—I've not finished with my dinner yet. —But our friends（）for us.

A. waited
B. to be waited
C. waiting
D. are waiting
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