Question

After ten years, she changed a lot and looked different from _______ she used to be.

A. that
B. whom
C. what
D. who

Answer 1

答案C
　what he/she/it used to be已经成为一种习惯说法,意为“过去的样子”。what指一种情况,并非指“人”,所以不能用who/whom。