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    ----There must be a dozen pens in the room, but I can never find one when necessary. ---- Keep looking. is sure to turn up. A. One B. It C. That D. This 【查看更多】

     

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    — There must be a dozen pens in the room,but I can never find one when I need them.
    — Keep looking. _____ is sure to turn up.

    [     ]

    A. One
    B. It
    C. That
    D. This

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    ―There must be a dozen pens in the room ,but I can never find one when I need them.

    ―Keep looking        is sure to turn up.

           A．one                    B．It                        C．That                   D．This

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    —There must be a dozen pens in the room ,but I can never find one when I need them.

    —Keep looking        is sure to turn up.

    A．One   B．It      C．That  D．This

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