单项选择题

If headaches only occur at night, lack of fresh air is often the cause.

A. deliver
B. fall
C. happen
D. arrive
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单项选择题
He inspired many young people to take up the sport()

A. encouraged
B. allowed
C. called
D. advised
单项选择题
In the background was that eternal hum ()

A.long
B. never-ending
C. boring
D. extensive
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