it和that的用法区别The cost is half as much as____used to be two years ago.为什么用it而不能用that?

it和that的用法区别The cost is half as much as____used to be two years ago.为什么用it而不能用that? the cost cost的用法 it,one,that作代词时候的用法和区别, THIS、THAT和IT的指代用法有什么区别? THIS,THAT和IT的指代用法有什么区别 which和that以及it的用法有什么区别? 请问It和that的区别用法最好有举例 当“花费金钱”讲时,cost 和take 的用法区别我知道take 的用法一般是it作形式主语,后面跟不定式.cost一般指sth cost sb some money.还有其他区别吗? cost的用法?(和pay,spend的区别) cost ,pay for ,spend,take,的用法,和区别 cost,spend,pay for,take,的用法,和区别, same的用法the same as 和 the same that 的用法有什么区别. pay,cost,spend用法上的区别 that与it用法区别 Cost unit 和 cost centre 的区别? cost conduction和cost conductions的区别 这些句子的不同和用法how much did it cost?how much did does it cost?how much did these cost?how much is it? 代词it,one,that,the one用法的区别（高中英语语法）