I really don't know what ___(say)about it为什么这样填?

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Ireallydon''tknowwhat___(say)aboutit为什么这样填?Ireallydon''tknowwhat___(say)aboutit为什么这样填?Ireallydon''tknow

I really don't know what ___(say)about it为什么这样填?
I really don't know what ___(say)about it
为什么这样填?

I really don't know what ___(say)about it为什么这样填?
to say
疑问词+不定式作宾语.