I don't think the experiment is ___ failure, because it has provided us with ___valuable experience for our future tests．
A．不填; 不填B．不填; aC．a(chǎn); 不填D．a(chǎn); a
C

試題分析：考查冠詞：句意：我認(rèn)為實(shí)驗(yàn)不是失敗，因?yàn)樗峁┪覀冇袃r(jià)值的經(jīng)驗(yàn)供將來(lái)實(shí)驗(yàn)用。第一空填a，a failure是一件失敗的事情，是抽象名詞具體化，第二空不填，experience是不可數(shù)名詞，泛指“有價(jià)值的經(jīng)驗(yàn)”，選C。
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