单项选择题

______ one has a child will one realize how great one's parents are.

A. Until
B. Not until
C. It is not until
D. Until not
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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
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
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