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【题目】Marking a book is _________ useful skill, but it is important to do it right.

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

【答案】A

【解析】

句意:在书上做标注是一项有用的技能,但正确地做是很重要的。考查冠词辨析题。the是定冠词表特指,本句skill(技能)是泛指,需用不定冠词aan修饰。useful以辅音因素开头,需用不定冠词a;根据句意语境,可知选A。

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