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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

While watching television,________________________.

 While watching television, __________.

    A．the doorbell rang                B．the doorbell rings

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

While watching television,         

         A．the doorbell rang                                            B．the doorbell rings

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

While watching television, __________.

A．the doorbell rang                      B．the doorbell rings

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

 While watching television, ________.    

While watching television，____      ．

A．the doorbell rang                       B．the doorbell rings

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

While watching television，____． 

A．the doorbell rang                       B．the doorbell rings

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

While watching television, __________.

　 A．the doorbell rang B．the doorbell rings

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

While watching television，________.

A．the doorbell rang　 B．the doorbell rings

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