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【题目】John gave a talk for ________ hour.

A.aB.anC.theD./

【答案】B

【解析】

句意: 约翰做了一个小时的演讲。

a/an不定冠词,表示泛指,意为“一个”,a用于辅音音素前an用于元音音素前。the定冠词,表示特指。该句中表示“一个小时”,hour以元音音素开头,故选B

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