1·B in fact, it's even a question whether a is a, but it's certainly not b, right? This much we know. In the grammatical sense there is no sort of mystification about the metaphor.
实际上，人们甚至对A是不是A都有疑问，但肯定不是，是吧，我们都知道这点，而从语法的角度来看，并没有像暗喻一样的神秘化。