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    33．While watching television, . A．the doorbell rang B．the doorbell rings C．we heard the doorbell ring D．we heard the doorbell rings 【查看更多】

     

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    While watching television, __________.

                    A．the doorbell rang                           B．the doorbell rings

                C．we heard the doorbell ring          D．we heard the doorbell rings

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    While watching television,________________________.

    A．the doorbell rang

    B．the doorbell rings

    C．we heard the doorbell ring

    D．we heard the doorbell rings

     

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     While watching television, __________.

        A．the doorbell rang                B．the doorbell rings

        C．we heard the doorbell ring       D．we heard the doorbell rings

     

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    While watching television,         

             A．the doorbell rang                                            B．the doorbell rings

             C．we heard the doorbell ring                           D．the doorbell ring was heard

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    While watching television, __________.

    A．the doorbell rang                      B．the doorbell rings

    C．we heard the doorbell ring             D．we heard the doorbell rings

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