【題目】—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：——你現(xiàn)在做運(yùn)動(dòng)嗎？——是的，我們所有人每天至少在學(xué)校內(nèi)外鍛煉一小時(shí)。at least至少，為固定詞組；hour ['a]以元音音素開頭，前面用不定冠詞an，故答案為D。

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