Turn off the light __ you leave.A afterB beforeC untilD when请写出原因

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Turnoffthelight__youleave.AafterBbeforeCuntilDwhen请写出原因Turnoffthelight__youleave.AafterBbeforeCuntil

Turn off the light __ you leave.A afterB beforeC untilD when请写出原因
Turn off the light __ you leave.
A after
B before
C until
D when
请写出原因

Turn off the light __ you leave.A afterB beforeC untilD when请写出原因
d
离开时关灯
after 离开后关灯 逻辑错误
before 离开前关灯 同上
until 关着灯,直到离开 (人在屋里的时候不开灯,走了再打开) 还是逻辑错误

D when
D when 当^^^时候,表示伴随
当你离开的时,把灯关上
句意通顺

A......
等你你走后,把办公室的灯关一下?