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
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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
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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