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    19、Lucy was having a holiday with her friend in a national park ____ she was bitten on the foot

    by a snake．

    A．while         B．since        C．once         D．when

    19、D

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    Lucy was having a holiday with her friend in a national park ____ she was bitten on the foot

    by a snake．

    A．while         B．since        C．once         D．when

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