【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(gè)小時(shí)的演講。

a/an不定冠詞,表示泛指,意為“一個(gè)”,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(gè)小時(shí)”,hour以元音音素開(kāi)頭,故選B。

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