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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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
单项选择题
Nanjing has changed so greatly that I think it is ______ a second time.
A．worth visiting
B．worthy visiting
C．worth being visited
D．worthy of visiting
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