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题库 / Prep2007E1-SC-115
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.
shown that in societies where they consume little salt, their
shown that in societies that have consumed little salt, their
shown that in societies where little salt is consumed,
they showed that in societies where little salt is consumed,
they showed that in societies where they consume little salt, their
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1、D在于主语冗余了，studies已经是第一个句子的主语了，and后面没必要再跟一个主语studies
2、关于D的一般过去时时态，一个句子根据动作发生时间的不同是可以有不同的时态的。I ran yesterday and swim today.
3、show短暂的或表结果的动词，也可以加have，Facts have shown us that he is trustworthy.事实已经表明他是值得信赖的。have done强调show这个动作产生了影响
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