that代指不可数名词或可数名词复数,it是特指,There's only one in the bookstore,why not buy it?it指就是那唯一的一本,即特指.that与one在单选中不好区分,one和ones分别指代上文提到的单数和复数名词,是泛指.There are many in the bookstore,why not buy one?指许多中的一本,随便一本,为泛指.还有 就是that后一般带代词,The weather in beijing is much colder than that in shanghai .that代wheater,不可数名词,后面接了in 介词.还有一些例子,我记不清了,是复习是做题时遇到的,很多类似的问题,你遇见一个总结一个,最后放到一起,研究研究就能区分了.
英语中it 和that和one和a 区别