单项选择题

All flights ______ because of the terrible weather, they had to go there by train.

A．having been canceled
B．had been canceled
C．having canceled
D．were canceled
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单项选择题
An energy tax would curb ordinary air pollution, limit oil imports and cut the budget ______
A．disposition
B．discrepancy
C．defect
D．deficit
单项选择题
______ receiving financial support from family, community or the government is allowed, it is never admired.
A．Once
B．Lest
C．As
D．Although
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