【題目】Math is _______ useful subject.

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

【答案】A

【解析】

句意: 數(shù)學是一門有用的學科。這里表示泛指，useful是以輔音音素開頭的詞, 所以其前不定冠詞用a。故選A。

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