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_______, the experiment will be successful.
A.If carefully doingB.If it done carefully
C.If carefully doneD.If doing carefully
C

试题分析:考查省略。在if引导的条件状语从句中,省略了主语和be动词,experiment与do之间是被动关系要用被动语态,即完整句子应该是,If the experiment is done carefully。所以答案选C。
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