单项选择题

______in Guangzhou for ten years, he knew the City very well.

A．Living
B．To live
C．Lived
D．Having lived
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单项选择题
Madame Curie is believed ______radium.
A．discovers
B．having discovered
C．to discover
D．to have discovered
单项选择题
If the earth suddenly ______ spinning, we wouldn't do anything.
A．stopped
B．stops
C．has stopped
D．is stopping
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