【題目】___________________, 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：這個實驗如果認(rèn)真被做就會成功。句中if引導(dǎo)的條件狀語從句中，省略了主語和be動詞，主語experiment與動詞do之間是被動關(guān)系要用被動語態(tài)，完整句子應(yīng)是：If the experiment is done carefully，故選C.

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