100．Proponents of artificial intelligence say they will be able to make computers that can understand English and other human languages，recognize objects，and reason as an expert does--computers that will be used to diagnose equipment breakdowns, deciding whether to authorize a loan，or other purposes such as these．
(A) as an expert does-computers that will be used to diagnose equipment breakdowns，deciding whether to authorize a loan，or other purposes such as these
(B) as an expert does，which may be used for purposes such as diagnosing equipment breakdowns or deciding whether to authorize a loan
(C) like an expert-computers that will be used for such purposes as diagnosing equipment breakdowns or deciding whether to authorize a loan
(D) like an expert，the use of which would be for purposes like the diagnosis of equipment breakdowns or the decision whether or not a loan should be authorized
(E) like an expert，to be used to diagnose equipment breakdowns，deciding whether to authorize a loan or not，or the like
C is correct.
我的问题是:
1. C中“——”起解释说明的作用，相当于定语从句,既然是定语从句,那为什么不是like an expert-computers will be used for ..., 而用that从句来修饰computers呢?
2.原文抽出主干为：they will be able to make computers that can understand...,recognize..., and reason like an expert --computers that will...,
computers that will 又好象是同位语,是谁的同位语呢?前边的compurers吗?自己做自己的同位语吗?
翻看了以前所有的讨论,还是不明白.请大家帮帮忙!!!谢谢!
1,一个介词短语（like an expert-computers ）怎么能作先行词呢?这里重新提出computer的目的就是为了防止定语从句修饰混淆。（防止混淆的方法1，重新写出修饰对象。2用such/this/that/these/those等指示代词+名词的方式重新强调修饰对象。3，用一个概括性名词强调修饰对象）
2，破折号后面为computer的同位语。这本身就是同位语的一种形式，noun, noun that...第二个noun重复第一个noun引出同位语从句
不敢班门弄斧…SC叫我郁闷到极致了，阅读和逻辑都没有这样过，我感觉还是需要时间和总结来克服这最重要的环节给我带来的困难～
谢谢mattus!怎么法文也上来了?
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