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    --This is useful book. I think. --So it is, and it’s unusual one. A. an, 不填 B. an, an C. a, an D. a, a 【查看更多】

     

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    --This is _______ useful book, I think.

    --So it is, and it's ________ unusual one.


    1. A.
      an; /
    2. B.
      an; an
    3. C.
      a; an
    4. D.
      a; a

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    — This is _____ useful book. I think.
    — So it is, and it's _____ unusual one.

    [     ]

    A. an, 不填
    B. an, an
    C. a, an
    D. a, a

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    --This is _______ useful book, I think.

    --So it is, and it's ________ unusual one.

    [　　]

    A．an; /

    B．an; an

    C．a; an

    D．a; a

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