单项选择题

I was just lying down when I heard someone ______ on the window.

A．break
B．try
C．hit
D．knock
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单项选择题
At no time ______ we are Chinese.
A．shouldn't we forget
B．we should forget
C．should we forget
D．we shouldn't forget
单项选择题
Edison never stopped ______ new and better ways to do things.
A．to search for
B．to search
C．searching for
D．searching
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