关于OG 语法中一道as用法题

tanecho0025

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 exper—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（C）
(E)  like an expert，to be used to diagnose equipment breakdowns，deciding whether to authorize
a loan or not，or the like
正确答案C，OG的解释如下：
Parallelism +Rhetorical construction
The sentence presents three functions of intelligent computers，but these functions(to diagnose…，deciding… or other purposes) are not
written in parallel ways．Moreover, the final function is vague．Turning this final function into an introductory statement and using parallel forms for the two dements diagnosing and deciding creates a stronger sentence．Either the clause，as an expert does, or theprepositional phrase, like an expert, is correct and idiomatic in this sentence．

我觉得OG说的：Either the clause，as an expert does, or theprepositional phrase, like an expert, is correct and idiomatic in this sentence．不正确。as expert does和原文that can的动词不一致，应该是as expert can才对，你们觉得呢？

超级无敌萍

gmat语法原则是选择相对最好的一项。相对最好就可以。