题目内容


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．a; 不填C．a ; aD．不填; a
B
考查冠词的用法。第一空，failure 为不可数名词，在这里用a failure 抽象名词具体化，指失败的事，第二空，experience 经验，是不可数名词，句意：我认为这次试验不是一件失败的事，因为它为我们将来的实验提供了有价值的经验。
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