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
科目：高中英語 來源： 題型：
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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