单项选择题

Do it now, ______ it will be too late.

A．for
B．and
C．or
D．before
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单项选择题
We must try our best to protect some of the ______ cultural treasures.
A．rare
B．precious
C．valuable
D．worthy
单项选择题
The reason I love her very much is ______ she is a little smart girl.
A．became
B．why
C．the fact that
D．that
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