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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热门试题

单项选择题He's watching TV He's ______ to be cleaning his room.

单项选择题People appreciate ______ with him because he has a good sense of humor.