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
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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
单项选择题
--Which will you have then, the white one or the blue one--I'll take ______ to give myself a change sometimes.
A．one
B．two
C．either
D．both
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