I don’t think the experiment is _______ failure．At least we have gained _______ experience for future success．
A．/; theB．a(chǎn); theC．/; /D．a(chǎn); /
D
考查冠詞用法。a failure 是抽象名詞具體化，指具體的人或者事，此處指的是一個失敗的實驗。第二空experience 作經(jīng)驗講，是不可數(shù)名詞，作經(jīng)歷講，是可數(shù)名詞，此處是獲得經(jīng)驗，所以是不可數(shù)名詞。故選擇D
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