单项选择题

Going into the office, ______ .

A．a letter was found on the table
B．there was a letter on the table
C．the table had a letter on it
D．he found a letter on the table
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单项选择题
Do it now, ______ it will be too late.
A．for
B．and
C．or
D．before
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
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