I don't know what books i should buy for my son .改为同意句

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I don't know what books i should buy for my son .改为同意句
I don't know what books i should buy for my son .改为同意句

I don't know what books i should buy for my son .改为同意句
I have no idea what books i should buy for my son.

i don't know what books i should send to my son

I don't know what books to buy for my son.