Jane,please turn off the lights befor—— you leave the classroom.A.after B.before c.until D.but说明以一下原因?

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Jane,please turn off the lights befor—— you leave the classroom.A.after B.before c.until D.but说明以一下原因?

Jane,please turn off the lights befor—— you leave the classroom.A.after B.before c.until D.but说明以一下原因?
Jane,please turn off the lights befor—— you leave the classroom.A.after B.before c.until D.but
说明以一下原因?

Jane,please turn off the lights befor—— you leave the classroom.A.after B.before c.until D.but说明以一下原因?
根据四个选项的意思来判断.A.在...之后 B.在..之前 C.直到...D.但是
题干的意思是：请在你离开教室之前把灯关了.
所以应该选择B.before.
这样解释明白了吗?

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