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?
Jane,please turn off the lights befor—— you leave the classroom.A.after B.before c.until D.but
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?
说明以一下原因?
英语人气：358 ℃时间：2019-08-21 13:14:24
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