It's much colder today than___yesterday.

问题描述:

It's much colder today than___yesterday.
A.that of
B.that
C.it is
为什么

这是几个句子合一起了:
It is cold yesterday .
It's much colder today.
The whether today is much colder than the whether of yesterday.
把第三句相应部分,用代词换掉,就是题中的了.