单项选择题

______ there are black clouds in the sky, it may rain.

A．After
B．For
C．Since
D．Because
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单项选择题
They rushed into the hall ______ the door opened.
A．when
B．if
C．after
D．as soon as
单项选择题
You will make the things worse ______ you refuse to apologize for that.
A．before
B．if
C．when
D．which
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