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Whoever leaves the room last must ______ that all the lights are turned off.
A.is sureB.make sureC.find outD.look out
B
短语必须。B确定;C发现,查明;D当心;A项不能放在must的后面。句意:任何一个最后离开房间的人必须确定所有的灯都被关闭了。根据句意说明B正确。
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