My uncle is quite worn out from years of hard work. He is no longer the man ______ he was fifteen years ago.
【正确答案】 D
【答案解析】解析：本题定语从句的先行词是the man，表特指，且先行词在定语从句中作表语，在这种情况下．关系代词只能用that，而不能用who或者which，因此，答案为D。