.If _____,the experiment will be successful.
A．carefully doingB．it done carefullyC．carefully doneD．doing carefully
C
考查狀語從句的省略。主語the experiment與do之間是被動(dòng)關(guān)系，所以用過去分詞done，句意：如果這個(gè)實(shí)驗(yàn)被認(rèn)真做的話，它會(huì)成功的。carefully done前省略了it is，所以選C。
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