【題目】A dog is _______ useful animal.

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

【答案】A

【解析】句意:狗是一種有用的動物。不定冠詞a/an表示泛指,定冠詞the表示特指,根據(jù)句意可知,此處表示泛指,useful ['jusfl] 是以輔音音素開頭,前面用不定冠詞a,故答案為A。

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