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

試題分析:固定結(jié)構(gòu)had better表示最好做某事,后跟動(dòng)詞原形;其否定形式在動(dòng)詞原形的前面加not即可。結(jié)合語(yǔ)境可知是考查had better的否定結(jié)構(gòu),故選B。
點(diǎn)評(píng):had better是一固定結(jié)構(gòu),其用法基本型相當(dāng)于一個(gè)情態(tài)動(dòng)詞,通常用在對(duì)話中表示建議或勸告,意為“還是……好”、“最好……”。它沒(méi)有人稱、數(shù)和時(shí)態(tài)的變化,had也不能改為has或have。
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