单项选择题

I tried hard, but I couldn't find the ______ to the problem.

A．solution
B．reply
C．help
D．demand
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单项选择题
There was a heavy fog this morning, so none of the planes could （）.

A．get through
B．pull out
C．take off
D．break away
单项选择题
My impression of the service in the hotel was that it had really ______.
A．imagined
B．imported
C．implied
D．improved
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