单项选择题

You have failed two tests. You’d better start working harder, （） you won’t pass the course.

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

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单项选择题

I didn’t know your mobile phone number; otherwise I （） you the moment I got to Washington.

A. had rung
B. would ring
C. have rung
D. would have rung

单项选择题

How can you keep fit （） you smoke so much every day.

A. but
B. however
C. if
D. otherwise

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