单项选择题

I don't think you two know each other, ______

A．do I
B．don't I
C．do you
D．don't you
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单项选择题
You should keep the milk in the ice box, ______ it will go bad.
A．so
B．but
C．and
D．or
单项选择题
If it rains, we should not go out, but the sky ______ perfectly clear.
A．is
B．will be
C．was
D．had been
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