I responded: Which chapter have we to read? - perfectly normal British English, as would be Which chapter have we got to read? or Which chapter do we have to read?; But the "correct" version - Which chapter do we've to read - is incorrect in British, American or any other English
Your versions are added now.
Things like "we've" here are never accepted by the team. They are accepted (but why the heck they get suggested sometimes?!) because of the algorithm. Why? Well, "we've" works as a contraction in "we've got", and the system cannot distinguish between a context where it makes sense and a context where it doesn't. Nothing we can do about it on our side, I'm afraid.