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英语选择并讲一下It was marie curie who __redium and __ X-ray machine

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英语选择并讲一下
It was marie curie who __redium and __ X-ray machines.
A.invented,discovered B.discovered,inveted
C.founded,invented D.discovered,found
B.discover:发现某种现象
find:找到某样东西
invent:某种发明(机器,设备)