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【题目】 I think Maths is ________ useful subject.

A. a. B. an.

C. the D. /

【答案】A

【解析】

试题分析:句意:我认为数学是一门有用的学科。根据句意及题干分析“一门有用的学科”是泛指,所以用不定冠词,useful开头发音是辅音,所以用不定冠词a,故选A。

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