【題目】 , the experiment will be successful.

A. If care fully doing B. If it was done carefully

C. If carefully done D. If doing carefully

【答案】C

【解析】考查省略句。句意：這個(gè)實(shí)驗(yàn)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(dòng)詞，主語experiment與動(dòng)詞do之間是被動(dòng)關(guān)系要用被動(dòng)語態(tài)，完整句子應(yīng)是：If the experiment is done carefully，故選C.

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