2. concerns should be deals. The verb should be the same as the verb in the second part of the sentence "deals" because there is a "whereas" that indicates the comparison between petrography and petrology.

xiaobaifan (littlelake)
(#320032@0)
2002-1-1 -05:00

回到话题: 请教托福语法

回到论坛: HOME枫下论坛枫下论坛主坛工作学习求学深造

URL:   
http://www.rolia.net/zh/post.php?f=0&p=320032