She doesn’t know .A. what she can do itB. what to do itC. how to doD. how to do it

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A. what she can do it
B. what to do it
C. how to do
(答案→)D. how to do it
解析：英语宾语从句中一般为陈述语序。What在宾语从句中一般用来代替主语或者宾语，意思是什么；how表示程度方式等，故选D，其他选项结构有误。