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

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動詞，experiment與do之間是被動關(guān)系要用被動語態(tài)，即完整句子應(yīng)該是，If the experiment is done carefully。所以答案選C。
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