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 On Sundays there were a lot of children playing in the park, _______ parents sitting together joking.

A. their               B. whose            C. which                           D. that

On Sundays there were a lot of children playing in the park, _______ parents sitting together joking.

A. their　　　　　　　　　　 B. whose

C. which　　　　　　　　　　 D. that

On Sundays there were a lot of children playing in the park, _______ parents sitting together joking.

    A. their               B. whose      C. which               D. that

 On Sundays there were a lot of children playing in the park, _______ parents sitting together joking.

    A. their               B. whose      C. which               D. that

On Sundays there were a lot of children playing in the park, _______ parents sitting together joking．

       A．their                  B．whose               C．which              D．that

On Sundays there were a lot of children playing in the park, _______ parents were sitting together joking.

A. their   B. whose

C. which D. that

On Sundays there were a lot of children playing in the park, _______ parents were sitting together joking.

A. their　　　　　　　　　　 B. whose

C. which　　　　　　　　　　 D. that