Nuclear energy may be dangerous if A．con...

Nuclear energy may be dangerous if

A．controls

B．not controlling

C．not controlled

D．controlled

C 【解析】考查状语从句的省略。当状语从句的主语和主句的主语一致的时候，可以把状语从句的主语和系动词一起省略。本题的if后面省略了Nuclear energy is.句意：如果核能没有被控制，将会是非常危险的。故C正确。

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