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
Since the matter was extremely ______, we dealt with it immediately.
A．tough
B．tense
C．urgent
D．instant
单项选择题
A survey was carried out on the death rate of new-born babies in that region, ______ were surprising.
A．as results
B．which results.
C．the results of it
D．the results of which
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