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    Is it since the 1990’s we began to use cell phones the number of them has greatly increased? A. while; when B. when; what C. before; that D. when; that 【查看更多】

     

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    I can still remember that it is since the 1990’s, _____ we began to use cell phones,_______ the number of mobile users has greatly increased．

           A．while; when    B．when; what     C．before; that     D．when; that

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    I can still remember that it is since the 1990’s, _____ we began to use cell phones,_______ the number of mobile users has greatly increased．

    A．while; when

    B．when; what

    C．before; that

    D．when; that

     

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    I can still remember that it is since the 1990’s, _____ we began to use cell phones,_______ the number of mobile users has greatly increased．


    1. A.
      while; when
    2. B.
      when; what
    3. C.
      before; that
    4. D.
      when; that

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    I can still remember that it is since the 1990’s, _____ we began to use cell phones,_______ the number of mobile users has greatly increased．

           A．while; when    B．when; what     C．before; that     D．when; that

    查看答案和解析>>


    I can still remember that it is since the 1990’s, _____ we began to use cell phones,_______ the number of mobile users has greatly increased．

    A．while; when B．when; whatC．before; that D．when; that

    查看答案和解析>>


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