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【题目】I have ____ dictionary, it is ____ useful book.

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

【答案】D

【解析】我有一本字典,它是一本有用的书。不定冠词a/an表示某一类人或某事物中的任何一个,经常用在第一次提到某人或某物时,用不定冠词起介绍作用,表示一个。a用于辅音音素前an用于元音因素前。根据句意可知表示介绍“一个”,dictionary以辅音音素开头,useful以辅音音素开头,故选D。

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