弱问一个基础语法问题。PREP1-Q115。有空的同学来帮下忙吧。

venus2elva

Many population studies have linked a high-salt diet to high rates of hypertension and shown that in societies where they consume little salt, their blood pressure typically does not rise with age.

(A) shown that in societies where they consume little salt, their

(B) shown that in societies that have consumed little salt, their

(C) shown that in societies where little salt is consumed,

(D) they showed that in societies where little salt is consumed,

(E) they showed that in societies where they consume little salt, their

选C。想问shown应该是和have liked平行吗？那为什么不是用have shown，动词也能这样省吗 = = 疑惑。求指教。多谢。

cidisnotjayz

have linked 和 have shown平行 省略了have
动词是shown，have是助动词。

venus2elva

have是助动词。

-- by 会员 cidisnotjayz (2010/4/17 22:50:51)

这样就理解了。就像can A,B, and C一样，can可以省。多谢指教。

木木OOO宝宝

shown 和linked 平行，共用了一个have