OG13 83 时态的理解问题

lindberghya

In 2000, a mere two dozen products accounted for half the increase in spending on prescription drugs, （a phenomenon that is explained not just because of more expensive drugs but by the fact that doctors are writing） many more prescriptions for higher-cost drugs.

A.a phenomenon that is explained not just because of more expensive drugs but by the fact that doctors are writing
B.a phenomenon that is explained not just by the fact that drugs are becoming more expensive but also by the fact that doctors are writing
C.a phenomenon occurring not just because of drugs that are becoming more expensive but because of doctors having also written
D.which occurred not just because drugs are becoming more expensive but doctors are also writing
E.which occurred not just because of more expensive drugs but because doctors have also written
Ans：B

我的问题是drugs are becoming....doctors are writing为什么是现在时态。主句谓语accounted明明表明是发生在过去哇.....请牛牛指教

lindberghya

宝宝的瓜 发表于 2013-12-13 22:05
唔，应该是这样的吧
看了语法版主的千行文件，里面对这一题的解释是
Umm 看一下OG12#133的解释

看来这类题不能上来就根据时态排除选项呀，学习了~~

宝宝的瓜

lindberghya 发表于 2013-12-13 16:28
诶~有道理，是不是说把一个过去的典型问题用 a phenomenon抽象出来作为一般问题来分析，所以就都用现在时 ...

唔，应该是这样的吧
看了语法版主的千行文件，里面对这一题的解释是
Umm 看一下OG12#133的解释

把那里的解释稍微摘抄一下过来：


if the sentence is meant to emphasize that the action is actually ongoing IN the present timeframe, then the present perfect is not the correct tense to use -- the present perfect (despite its name) does not necessarily indicate that the action continues through the present timeframe.
this is, in fact, the only main function of the present progressive (is/are -ING) tense, which is therefore an excellent choice for this sentence.（同样也是一个发生在过去的事情last week，但是却用了 is protecting；这里也是，一个发生在2000年事情，用了are becoming来解释）

所以大概是这样的吧~ 同样学习语法中，只能说算是互相帮助啦！

lindberghya

宝宝的瓜 发表于 2013-12-13 16:25
哈哈 小白来猜一个，我觉得是这里a phenomenon that is explained not just by the fact that drugs are be ...

诶~有道理，是不是说把一个过去的典型问题用 a phenomenon抽象出来作为一般问题来分析，所以就都用现在时态了？

宝宝的瓜

哈哈 小白来猜一个，我觉得是这里a phenomenon that is explained not just by the fact that drugs are becoming more expensive but also by the fact that doctors are writing many more prescriptions for higher-cost drugs.说的都是解释这个客观现象，前面主句完整，后面应该是同位语从句吧？。。。。这里phenomenon里两个fact正在发生，所以现在进行时哇
轻拍~

naoyixue

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