这道题考察as likely as,相信楼主很快就排除了ABC,再看正确答案E,把整句话补全,就是Traffic safety officials predict that drivers will be as likely to exceed the proposed speed limit as they are (likely to exceed) the current one. 整句话的意思就是说,官方认为司机以后超速的可能性跟现在超速的可能性是一样的,这样as...as...前后是平行的,但是如果是D,首先,D把exceed the limit这句话变成了一个that引导的从句,那么这个they放在这里首先就非常模糊了,假设去掉比较级as...as,这句话变成traffic safety officials predict that drivers wiill be likely that they will exceed the proposed speed limit.they到底指代officials还是drivers?这里会产生歧义,同时that后面的内容作了从句成分,那么as...as...前后的比较对象是什么?这样就变成了一个that从句跟一个不是That从句的内容比较,违背了gmat的平行原则,所以选E
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