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【单选题】

       raining hard for 3 hours without stopping.

A.
It is
B.
It was
C.
It has been
D.
It had been
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参考答案:
参考解析:
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举一反三

【单选题】All these gifts must be mailed immediately _____ in time for Christmas. [ ]

A.
in order to have received
B.
in order to receive
C.
so as to be received
D.
so as to be receiving