单项选择题

Their parents once lived under very severe conditions.

A．sound
B．hard
C．strict
D．tight
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单项选择题
It seems highlyunlikely that she will pass the exam.
A．very
B．completely
C．usually
D．mostly
单项选择题
If headaches only occurat night, lack of fresh air is often the cause.
A．deliver
B．fall
C．happen
D．arrive
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