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【题目】___________________, the experiment will be successful.
A.If carefully doing
B.If it was done carefully
C.If carefully done
D.If doing carefully

【答案】C
【解析】句意:这个实验如果认真被做就会成功。句中if引导的条件状语从句中,省略了主语和be动词,主语experiment与动词do之间是被动关系要用被动语态,完整句子应是:If the experiment is done carefully,故选C.

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