单项选择题

We found it impossible ______ all the questions within the time given.

A．solve
B．being solving
C．to have solved
D．to solve
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单项选择题
We don ' t allow ______ in the meeting room.
A．to smoke
B．smoked
C．smoking
D．to smoking
单项选择题
There were ______ for Saturday' s movie.
A．not available tickets
B．no available tickets
C．no tickets available
D．tickets no available
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