A dog is useful animal.A. a B. an C. the D. / A [解析]句意:狗是一种有用的动物.不定冠词a/an表示泛指.定冠词the表示特指.根据句意可知.此处表示泛指.useful ['ju?sf?l] 是以辅音音素开头.前面用不定冠词a.故答案为A. 题目和参考答案——青夏教育精英家教网—

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A dog is _______ useful animal.

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

A 【解析】句意：狗是一种有用的动物。不定冠词a/an表示泛指，定冠词the表示特指，根据句意可知，此处表示泛指，useful ['ju?sf?l] 是以辅音音素开头，前面用不定冠词a，故答案为A。

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