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【题目】He is __________ unusual inventor and he invented _________ useful invention.

A. a; an B. a; a C. an; an D. an; a

【答案】D

【解析】

试题分析:句意他是一个不寻常的发明家,而且他发明了一个有用的东西。不定冠词An用于以元音音素开头的单词前面;不定冠词A表示泛指,定冠词the用于表示特指。故选D。

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