He does not know how to do (it)还是what to do (it) 还带括号吗

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Hedoesnotknowhowtodo(it)还是whattodo(it)还带括号吗Hedoesnotknowhowtodo(it)还是whattodo(it)还带括号吗Hedoesnotknowh

He does not know how to do (it)还是what to do (it) 还带括号吗
He does not know how to do (it)还是what to do (it) 还带括号吗

He does not know how to do (it)还是what to do (it) 还带括号吗
前者可要可不要it,后者不能要it.因为do已经有宾语what了.