单项选择题

All the flights ______because of the extremely heavy rain, we had to postpone our schedule.

A. were canceled
B. had been canceled
C. having canceled
D. having been canceled
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单项选择题
They work long hours but do not earn enough to ensure a(n) ______ living for themselves and their families.
A. reticent
B. decent
C. innocent
D. descent
单项选择题
The vision of that big black car hitting the sidewalk a few feet from us will never be______from my memory.
A. ejected
B. escaped
C. erased
D. omitted
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