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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; aD.a; 不填
D

试题分析:句意:我认为该实验不是一个失败,因为它已经给我们未来的测试提供了有价值的经验。第一空泛指类别。这里是抽象名词具体化,作可数名词用;第二空experience 作“经验”讲时,是不可数名词。这里不能加冠词,因为它不是具体化的抽象名词它只是一个普通的概念;作“经历”讲时,是可数名词。在这个题中,明显是说“因为它为我们今后的测试提供了宝贵的经验”。
考点: 考查冠词的用法。
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