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'm sure he is up to the job ______ he would give his mind to it.
A．if only
B．in case
C．until
D．unless
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