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【题目】He was in such a hurry that he went up the stairs --- three at time.

A.aB.anC.theD./

【答案】A

【解析】

句意:他很着急,所以一次走三个台阶。

考查固定搭配。at a time意为“一次,每次”固定搭配;at the time意为“那时候,在那时”,固定搭配。an用于以元音开头的词前,而time以辅音开头,所以排除B项。D项是错误项,正确搭配是at times,意为“有时,间或”。综上所述,故选A

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