单项选择题

The bell is ringing （）the lesson is over.

A. but
B. or
C. and
D. yet

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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
单项选择题
Jane wasn’t in when Jack came, was she ______, but she returned a few minutes later.
A. No, she was
B. No, she wasn’t
C. Yes, she was
D. Yes, she wasn’t
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