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【题目】Sam had _________ idea. It’s _________ good idea. ( )

A.the; theB.an; aC.an; anD.a; a

【答案】B

【解析】

句意为“山姆有一个好主意。它是个好主意。”表示一个要用不定冠词a/ana用于辅音的发音前,an用在元音发音前,idea第一个发音是元音,用angood的一个发音是辅音,用a,故选B

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