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【题目】We all know _____ pollution is _____ big problem.

A. the, / B. a, / C. /, a D. /, the

【答案】C

【解析】

句意:我们都知道污染是一个大问题。考查冠词辨析题。本句是宾语从句,引导词that省略;big以辅音因素开头,需用不定冠词a。根据句意结构和语境,可知选C。

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