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【题目】Is this _____apple?

A. a B. an C. the D. /

【答案】B

【解析】句意:这是一个苹果吗?不定冠词a/an,意思是一个,a用于辅音开头的单词前,an用于元音开头的单词前,定冠词the意思是这个,那个,用于上文提到的东西或人;apple元音音素开头,故选B

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