Marias looks much healthier than she ___ five years ago.

问题描述:

Marias looks much healthier than she ___ five years ago.
A.is B.was C.did D.does

此处did是代替looked
在英语中为了避免重复和简单起见 经常用do 来代替前面出现过的动词
因为是过去式 所以用did