The poor child stood there and what to do turned to his father for help.A. not knowingB

问题补充：

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

答案：

(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。