【題目】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】

試題分析:句意他是一個(gè)不尋常的發(fā)明家,而且他發(fā)明了一個(gè)有用的東西。不定冠詞An用于以元音音素開(kāi)頭的單詞前面;不定冠詞A表示泛指,定冠詞the用于表示特指。故選D。

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