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

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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
单项选择题
David has ______ much work to do that he is staying late at his office.
A．such
B．very
C．so
D．enough
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