“You can't judge a book by its cover”,---------.

“You can't judge a book by its cover”,_________.
A as the saying goes old
B goes as the old saying
C as the old saying goes
D goes as old the saying
请问“You can't judge a book by its cover”,
请问为什么不能倒装,就是goes不能放前面?
第一句里,为什么old作为形容词不能放在goes后面?我想知道这个语法点,请不要从翻译的角度说.
感恩!