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    6．They were playing in the garden they heard a scream. A．when B．as C．until D．while 【查看更多】

     

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    They were playing in the garden        they heard a scream.

          A．when                   B．as                        C．until                      D．while

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    They were playing in the garden        they heard a scream .

           A．while       B．as     C．until  D．when

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    They were playing in the garden ________ they heard a scream．

    [　　]

    A．while．

    B．as

    C．until

    D．when

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