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

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

【答案】C

【解析】

句意：我們都知道污染是一個大問題�？疾楣谠~辨析題。本句是賓語從句，引導(dǎo)詞that省略；big以輔音因素開頭，需用不定冠詞a。根據(jù)句意結(jié)構(gòu)和語境，可知選C。

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