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When you are sleeping, you had better______ all the windows closed.                                    
A.don’t keepB.not keep
C.not to keepD.not keeping
B

试题分析:固定结构had better表示最好做某事,后跟动词原形;其否定形式在动词原形的前面加not即可。结合语境可知是考查had better的否定结构,故选B。
点评:had better是一固定结构,其用法基本型相当于一个情态动词,通常用在对话中表示建议或劝告,意为“还是……好”、“最好……”。它没有人称、数和时态的变化,had也不能改为has或have。
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