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    The traditional goal of science is to discover how things are, not how they ought _____.

    A. to be B. be C. have been D. To

    A

    【解析】

    试题分析：考查情态动词。Ought to就是一组情态动词，ought不能单独使用。用to be这句话才是完整的。句意：科学研究的传统目的是发现食物是怎样的，而不是他们应该是怎样的。故选A。

    考点：考查情态动词。

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