【題目】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:在書(shū)上做標(biāo)注是一項(xiàng)有用的技能,但正確地做是很重要的?疾楣谠~辨析題。the是定冠詞表特指,本句skill(技能)是泛指,需用不定冠詞aan修飾。useful以輔音因素開(kāi)頭,需用不定冠詞a;根據(jù)句意語(yǔ)境,可知選A。

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