高等教育 / 大学英语3
(单选题) Before that a certain scientist _ _ _ _ _ _ this something _ _ _ _ “radioactivity”.( )
A、had named, as
B、had called, for
C、had found, calling
D、had found, called
A、had named, as
B、had called, for
C、had found, calling
D、had found, called
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