John isn't the same man ____ before.

John isn't the same man ____ before.
A、what he was
B、that he was
C、who he was
D、as he was
【正确答案】：D
【题目解析】：本题测试固定搭配。“the same as”为固定搭配，意思是：和……一样。本句的意思是：“约翰和以前不一样了。”