The poor child stood there, and what to do, turned to his father for help.
A. not knowing
B. not knew
C. not to know
D. not know
网友回答
(答案→)A. not knowing
B. not knew
C. not to know
D. not know
解析：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。