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
As teachers we should concern ourselves with what is said, not what we think______.
A．ought to be said
B．must say
C．have to be said
D．need to say
单项选择题
What he said just now bad little to do with the question______ discussion.
A．on
B．in
C．under
D．at
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