﹣Lucy，whenyouleavetheroom,please

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﹣Lucy，when you leave the room, please ____the light. ﹣OK, Mom.

A. put off B. turn off C. turn up

【解析】句意：-Lucy，当你离开房间的时候，请关上灯。-好的，妈妈。

put off推迟； turn off关掉； turn up出现；开大。根据句意when you leave the room, please…the light可知，turn off符合语境，故选：B。