D
考查冠词的用法。第一空，抽象名词具体化a failure，失败的事，第二空，failure不可数名词，失败，第三空为固定短语：a good state of mind一种良好的心态，句意：这次试验是一件失败事，但是的确要记住在面临失败的时候，你应该仍然保持一种良好的心态。所以选D。
The experiment is______failure．But do remember that，in the f
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