Nuclear energy may be dangerous if                          
A．controlsB．not controllingC．not controlledD．controlled
C
考查狀語(yǔ)從句的省略。當(dāng)狀語(yǔ)從句的主語(yǔ)和主句的主語(yǔ)一致的時(shí)候，可以把狀語(yǔ)從句的主語(yǔ)和系動(dòng)詞一起省略。本題的if后面省略了Nuclear energy is.句意：如果核能沒有被控制，將會(huì)是非常危險(xiǎn)的。故C正確。
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