单项选择题
It was essential that the application forms ______ back before the deadline.
A．must be sent
B．would be sent
C．be sent
D．were sent
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单项选择题
He won the first place in the national mathematics ______.
A．content
B．contest
C．context
D．consent
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单项选择题
This room is ______ that one.
A．three times large than
B．three times large as
C．as large three times as
D．three times as large as
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