I think Maths is ________ useful subject.

A. a. B. an.

C. the D. /

A 【解析】 試題分析：句意：我認(rèn)為數(shù)學(xué)是一門有用的學(xué)科。根據(jù)句意及題干分析“一門有用的學(xué)科”是泛指，所以用不定冠詞，useful開頭發(fā)音是輔音，所以用不定冠詞a，故選A。
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