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【题目】—Do you do any sports now?

—Yes, all of us exercise at________least________hour a day in and outside school.

A. the; a B. a; an C. /; a D. /; an

【答案】D

【解析】句意:——你现在做运动吗?——是的,我们所有人每天至少在学校内外锻炼一小时。at least至少,为固定词组;hour ['a]以元音音素开头,前面用不定冠词an,故答案为D。

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