_______, the experiment will be successful.

A. If carefully doing B. If it done carefully

C. If carefully done D. If doing carefully

 

C

【解析】

試題分析：考查省略。在if引導(dǎo)的條件狀語從句中，省略了主語和be動(dòng)詞，experiment與do之間是被動(dòng)關(guān)系要用被動(dòng)語態(tài)，即完整句子應(yīng)該是，If the experiment is done carefully。所以答案選C。

考點(diǎn)：考查省略

 

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