It is much colder today that of yesterday.为什么用that of 为什么有of

It is much colder today that of yesterday.为什么用that of
为什么有of

是It is much colder today than that of yesterday吧? that 指代天气 不是跟昨天比 而是跟昨天的天气比 所以要用that of yesterday 表示昨天的天气

that特指昨天的天气

我怎么觉得是D呢？！~~
D 连词than的前后句子结构应当相同，前面是it is，结构是it+be动词，故后面的也应该是it+be动词。由于后面的时间是昨天，所以动词时态应为过去时，所以完整的句子是It's much colder today than it was yesterday. 这里的it代指天气(the weather)...

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我怎么觉得是D呢？！~~
D 连词than的前后句子结构应当相同，前面是it is，结构是it+be动词，故后面的也应该是it+be动词。由于后面的时间是昨天，所以动词时态应为过去时，所以完整的句子是It's much colder today than it was yesterday. 这里的it代指天气(the weather)

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应该是It is much colder today than yesterday.
that of 是即的意思，不应放在这儿。