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    【题目】I don't know who invented ________ telephone. It's really ________ most useful invention.
    A.the; a
    B./; a
    C.a; the
    D./; the

    【答案】A
    【解析】这题考查冠词，第一空是表示发明物，特指，加the，第二空：a most useful是“非常有用”，这里的most相当于very。选A。

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