单项选择题

Madame Curie is believed（）radium.

A. discovers
B. having discovered
C. to discover
D. to have discovered

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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
单项选择题
It is high time that you（）for the job interview.

A. prepared
B. prepare
C. to prepare
D. will prepare
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