单项选择题

I don' t think he is serious, ______

A．do I
B．is he
C．don' t I
D．isn' t he
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单项选择题
Do what you think is right, ______ they say.
A．however
B．whatever
C．whichever
D．if only
单项选择题
We must leave the party at exactly 9:00 ______ we'll be late for work.
A．for else
B．other
C．else
D．otherwise
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