Jane,please turnoff the lights-----you leave the classroom.A.after B.before C.until D.but

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Jane,pleaseturnoffthelights-----youleavetheclassroom.A.afterB.beforeC.untilD.butJane,pleaseturnoffth

Jane,please turnoff the lights-----you leave the classroom.A.after B.before C.until D.but
Jane,please turnoff the lights-----you leave the classroom.
A.after B.before C.until D.but

Jane,please turnoff the lights-----you leave the classroom.A.after B.before C.until D.but
b
这道题目我以前做过
根据语境
其实用when更好