B.must be turned off
你离开前必须关灯.
3.The light in the room------before you leave.A.are turned B.must be turned off
3.The light in the room------before you leave.A.are turned B.must be turned off
如果知道答案,请说明理由.
如果知道答案,请说明理由.
英语人气：981 ℃时间：2019-10-05 13:52:39
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