单项选择题

No word came （）he joined them in playing football.

A. that
B. whether
C. which
D. what

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单项选择题
The bell is ringing （）the lesson is over.

A. but
B. or
C. and
D. yet
单项选择题
—The air is full of smoke and people are coughing. —It will get worse （）the government does something about the pollution.

A. but
B. unless
C. except
D. if
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