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--What do you think of cloning?
--No doubt it’s a great invention. But ________, it may have some side effects.
A.if not properly handlingB.if properly not handled
C.if not properly handledD.if properly not handling
C

试题分析:考查分词的用法。题意,如不能正确处理,克隆可能有副作用。修饰分词否定式的副词应置于not之后,排除B,D项;分词做状语的时候,如句子主语是分词动作的承受者,应该使用过去分词,排除A项。故C项正确。
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