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 题目和参考答案——青夏教育精英家教网—

题目内容

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

【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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