Question

he weather turned out to be very good and ___ was more than we could expect.为什么用that，不用it。

这两者在指代句子或事情时区别是什么
这里that 应指前面一整个句子吧

Answer 1

the weather turned out to be very good and ___ that was more than we could expect.
that指的是the whether 属于不可数名词 ，不能用it代替whether。
it只能代替 同一个可数名词 单数

Answer 2

这是一个主语从句，that指代前面整件事情，而主语从句里面是没有it来充当引导词的。

Answer 3

it指代同名同物;that则指代同名异物