题目内容

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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