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
Research findings show we spend about two hours dreaming every night, no matter what we ______ during the day.
A．should have done
B．would have done
C．may have done
D．must have done
单项选择题
We are all for your proposal that the discussion
A．be put off.
B．was put off
C．should put off
D．is to put off
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