【題目】We saw _____ UFO in the sky a week ago. It was _____ unusual thing.
A.an; an
B.a; an
C.a; a
D.an; a

【答案】B
【解析】句意為:一個(gè)星期以前我在天空中看見一個(gè)不明飛行物。那是一個(gè)不尋常的東西。結(jié)合選項(xiàng)可知,本題考查的是冠詞的用法。在英語(yǔ)中,a和an均用于單數(shù)可數(shù)名詞前,表示泛指“一個(gè)”。a用于輔音開頭的詞前,an用于元音開頭的詞前。the表示特指,尤其指上文提到的人或物,還用于序數(shù)詞和最高級(jí)形容詞前。根據(jù)語(yǔ)境,這里指的是泛指“一個(gè)”,UFO為輔音開頭,unusual為元音開頭。故應(yīng)選B。

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