Question A is a clear duplicate of Question B, which has already been put on hold. (OK, at least A has responded to the "What did you try?" type questions.) However, if you try to close Question A for being a duplicate of B, this is forbidden because "The question [B] does not have an upvoted or accepted answer".
Why is this a reason for refusing to close a question? Why is it reasonable to have two copies of a question that hasn't been answered but not to have two copies of a question taht has been answered? The first time it was posted, it was not answered because it was inappropriate for the site. The second time it was posted, it was still inappropriate for the site.