单项选择题

What's the matter I smell something.

A．burn
B．burns
C． burning
D． being burned
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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
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
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