单项选择题

All flights __ because of the snowstorm, many passengers could do nothing but take the train.

A． had been canceled
B． have been canceled
C．were canceled
D． having been canceled
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单项选择题
I hope all the precautions against air pollution, __ suggested by the local government, will be seriously considered here.
A．while
B．since
C．as
D．after
单项选择题
If I __ you, I would go to look for him.
A． was
B．were
C．would be
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