【题目】Please ______ that all lights are turned off.
A. enclose B. enlarge
C. ensure D. enable
在线课程【答案】C
【解析】考查动词辨析。句意：请确保所有的灯被关闭。A. enclose 围住,把,附上； B. enlarge 扩大；C. ensure 确保； D. enable 使能够，根据句意思可以推断出答案，故选C。
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