单项选择题

This room needs ______.

A．clean
B．to clean
C．being clean
D．cleaning
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单项选择题
Not ______ any letter from him, I gave him a call.
A．receive
B．receiving
C．received
D．have received
单项选择题
If that Shell had hit us half a second sooner, it ______ the pilot.
A． might have hit
B．might hit
C．must have hit
D．would hit
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