what引导的名词性从句These machines are better than ( ) we turned out last year.括号里为什么填those而不是what?

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what引导的名词性从句Thesemachinesarebetterthan()weturnedoutlastyear.括号里为什么填those而不是what?what引导的名词性从句Thesemac

what引导的名词性从句These machines are better than ( ) we turned out last year.括号里为什么填those而不是what?
what引导的名词性从句
These machines are better than ( ) we turned out last year.括号里为什么填those而不是what?

what引导的名词性从句These machines are better than ( ) we turned out last year.括号里为什么填those而不是what?
These machines 【are better than 比较结构】【those(=those machines)】we turned out last year.
比较结构中,要保持比较对象相同且不重复,可以用代词代替前面的名词.
在前面没有给出明确叙述对象的时候,可以用what.
例如:
This is/these are what we need.
祝你开心如意!

此处明显有前后对照的关系,前面说了these machines 后面明显是要区别现在用的与过去淘汰的两批机器,those 与these 相对应,更符合句子的意境。