【題目】John gave a talk for ________ hour.

A.aB.anC.theD./

【答案】B

【解析】

句意: 約翰做了一個小時的演講。

a/an不定冠詞,表示泛指,意為“一個”,a用于輔音音素前an用于元音音素前。the定冠詞,表示特指。該句中表示“一個小時”,hour以元音音素開頭,故選B。

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