单项选择题

It's very nice __ you to help me.

A．for
B． in
C．like
D． of
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单项选择题
What's the matter I smell something.
A．burn
B．burns
C． burning
D． being burned
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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