问一道很纠结的语法题。

seuhongkai

Proponents of artificial intelligence say they willbe able to make computers that can understand English and other humanlanguages, recognize objects, and reason as an expertdoes—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 todiagnose equipment breakdowns, deciding whether to authorize a loan, orother purposes such as these
(B) as an expert does, which may be used for purposes such asdiagnosing equipment breakdowns or deciding whether to authorize a loan
(C) like an expert—computers that will be used for such purposes asdiagnosing equipment breakdowns or deciding whether to authorize a loan
(D) like an expert, the use of which would be for purposes like thediagnosis of equipment breakdowns or the decision whether or not a loanshould be authorized
(E) like an expert—computers that will be used for such purposes as todiagnose equipment breakdowns or to decide whether to authorize a loan
E和C是怎么区别的？很迷惑的选了C.
不知道出处，大家看看吧……

xiruihuang

表目的的 在GMAT都用to do... 摒弃v-ing形式

fengyingx

答案是E吗？

purpose似乎该和to搭配。。。但是我看答案似乎答案是C啊 ？求高手解答！

linglingdan

这个考的是be used as和be used for的用法，这个应该是选C.
A be used as B      表示-把A当做B来使用
A be used for B     表示-B使用A
这里的FOR后面接的是目的而不是类似于computers一类的关系词，所以C这里的As用法是正确的。
A be used as to这个用法根本没有。所以E必错。

iwvers

我怎么觉得是在考SUCH ...AS...的用法.但是我查了longman,没有发现有such...as to do 或doing得用法

seuhongkai

谢谢各位！