Oh,sorry!i really don't know hao--（do）it.应该填什么?

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Oh,sorry!i really don't know hao--（do）it.应该填什么?
Oh,sorry!i really don't know hao--（do）it.应该填什么?

Oh,sorry!i really don't know hao--（do）it.应该填什么?
to do