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    【题目】This is _______useful book.

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

    【答案】A

    【解析】句意：这是一本有用的书。不定冠词a/an表示泛指，a用以辅音音素开头的单词前，an用以元音音素开头的单词前，定冠词the表示特指，useful ['jusfl]以辅音音素开头，前面用不定冠词a，故答案选A。

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