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—Who is this boy?
—Sorry, I       .
A.not knowB.know not
C.don’t knowD.not do know
C

试题分析:句意:这个男孩是谁?对不起,我不认识。know是实意动词,对于实意动词的否定形式,一般用do/does来帮忙构成。故选C.
点评:英语中否定句的构成注意一下几点:1)找出句中的BE动词,在BE动词的后面加not(或缩写为isn’t, aren’t,但am not不能缩写)。如果句中有some,改为否定句时要变成any。2)找出句中的can,在can的后面加not(或缩写为can’t)。如果句中有some,改为否定句时要变成any。3)如果句中没有的BE动词和can,改否定句时要添加don’t或doesn’t。当句子的主语为第三人称单数时,就在主语后面加doesn’t,原句中的动词改为原形。除此之外都加don’t。如果句中有some,改为否定句时要变成any。
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