Sentence Correction

试题详情

题目:

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.

选项:

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

答案:

C

提问:

本来选了d。。。有点搞不清楚这个and,为什么不是have shown直接就可以写shown,我还以为是非谓语呢。and后面可以省略主语咩
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提问:

这题为什么不能选a,是因为a中的they指代不清么?
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提问:

在这里为什么可以直接用shown?
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