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The poor child stood there, and ________ what to do, turned to his father for help.   
A.not knowingB.not knewC.not to knowD.not know
A

试题分析:考查非谓语动词。从第一个逗号起,分为两个分局,第二个分句包含一个非谓语动词短语“________ what to do,”,不小心的话,会受到and的影响而误选B。Know与the poor child是主谓关系,一个使用现在分词表主动和伴随状况,故选A。
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