i don't know ( )i should do to improve my english.a,how b,what为何不选how

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i don't know ( )i should do to improve my english.a,how b,what为何不选how
i don't know ( )i should do to improve my english.a,how b,what
为何不选how

i don't know ( )i should do to improve my english.a,how b,what为何不选how
B what I should do
A 应该说:How I should do it to ...