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
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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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