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.

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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.
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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.
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.

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.
B.must be turned off
你离开前必须关灯.