有谁知道GMAT语法连词and yet前加逗号的用法？

GMAT语法As做连词是怎样的？

　　1。表示时间： 　　意为“随着…”，表示两个同时正在演变的情况。 　　例题：As more and more people invest their money in savings certificates or money-market funds m order to earn higher interest, they are abandoning traditional low-interest investment havens such as passbook accounts and life insurance policies。 　　(A)As more and...全部

  　　1。表示时间： 　　意为“随着…”，表示两个同时正在演变的情况。 　　例题：As more and more people invest their money in savings certificates or money-market funds m order to earn higher interest, they are abandoning traditional low-interest investment havens such as passbook accounts and life insurance policies。
   　　(A)As more and more people invest their money 　　(B)While people have more and more been investing their money 　　(C)As money is more and more invested by people 　　(D)More and more 。
   when investors put their money 　　(E) While, more and more • investors have been putting their money 　　睡解：C中用被动语态违反了主动优选原则：B、D。
   E表达不对，A表示了 invest 和abandon两个动作是同时发生的。这是一个逐渐演变的过程。 答案：A 语法点提示：more and more越来越多的：invest in投资于… 　　2。
  表原因: 　　如：We paid him generously as he had done the work well 　　3。表让步： 　　语气比although, though强一些，注意句中的语序变化。
   　　Cold as it Was we went out。 　　Try as he would, he could not lift the rock。 　　该种用法在改错中末出现过。但在阅读中经常出现，由于其语序的特殊性，经常让考生不知所云，请对此种用法引起注意。
   　　4。表示动作的方式，强调某一动作与另一动作的相似性。(GMAT考核的重心) 　　Quasars are so distant that their light have taken billions of years to reach the Earth： consequently, we see them as they were during the formation of the universe。
   　　(A)we see them as they were during 　　(B)we see them as they had been during 　　(C) we see them as if during 　　(D)they appear to us as they did in 　　(E)they appear to us as though in 　　题解：本句大意，类星体那样的遥远以至于它们的光需要儿十亿年才能到达地球，因此，我们看到类星体的样子就是它们在宇宙形成时的样子。
  as if。 as though之后一般跟从句，而不跟介词短语：同时它们含有“与事实相反之意”，改变了句意因而C、E是错的。 B中从句中的过去完成时是没有根据的，D中句子的强调主体we变成了 they。
  同时did替代前面的appear to us。导致句意违背客观事实，因为宇宙形成时并没有人类存在。答案：A 　　除此之外，GMAT改错常考到的as表方式的句型有以下几种： 　　(1)a do(does)sth。
  , just as b do(does)： 　　(2)just as c do(did。 does)sth。, SO b do(did。 does)： 　　(3)just as c do。 So too+倒装句子/正常语序的句子。
  可译为“正如…，同样地…”。收起