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
How can you keep fit ____you smoke so much every day
A．but
B．however
C．if
D．otherwise
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单项选择题
By no means ____to her parents
A．this is the first time has she lied
B．this is the first time does she tell a lie
C．this is the first time she had lied
D．this is the first time she was lying
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