The light in the room must be turned offThe light in the room must be turned off before you leave .为什么要用must be 不是填must turn off

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• The light in the room must be turned offThe light in the room must be turned off before you leave .为什么要用must be 不是填must turn 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.
• 3.The light in the room------before you leave.A.are turned B.must be turned off
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