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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】

試題分析：考查情態(tài)動詞。Ought to就是一組情態(tài)動詞，ought不能單獨使用。用to be這句話才是完整的。句意：科學研究的傳統(tǒng)目的是發(fā)現(xiàn)食物是怎樣的，而不是他們應該是怎樣的。故選A。

考點：考查情態(tài)動詞。

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