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    –Never before so popular with the young people in China. --Yes. That’s because they are considered to be very useful as well as look fashionable. A. have mobile phones been B. mobile phones have been C. had mobile phones been D. mobile phones had been 【查看更多】

     

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    –Never before _____ so popular with the young people in China.

      --Yes. That’s because they are considered to be very useful as well as look fashionable.

    A. have mobile phones been

    B. mobile phones have been

    C. had mobile phones been

    D. mobile phones had been

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    －Never before ________ so popular with the young people in China．

    －Yes．That's because they are considered to be very useful as well as look fashionable．

    [　　]
    A．

    have mobile phones been

    B．

    mobile phones have been

    C．

    had mobile phones been

    D．

    mobile phones had been

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