Whoever leaves the room last must ______ that all the lights are turned off.
A.is sureB.make sureC.find outD.look out
B
短語必須。B確定;C發(fā)現(xiàn),查明;D當(dāng)心;A項(xiàng)不能放在must的后面。句意:任何一個(gè)最后離開房間的人必須確定所有的燈都被關(guān)閉了。根據(jù)句意說明B正確。
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