请教OG13-SC86 一个ving的问题

derekd0331

86. 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 writingmany 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[11] (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 最近研究了好些v+ing的用法，看到这道题出现了一个occurring就敏感了。 想请问大家： 1.我知道C选项后面表达相当奇怪，肯定错误。但是OG没有提到phenomenon+occurring是否错误？这里可以这样用吗？貌似v+ing修饰前面的名词？但貌似不正确的 2.这道题的B选项，如果我把改成B.occuring not just because drugs are becoming more expensive but also because doctors are writing

让occuring做补充说明，修饰前面的entire clause,这样可以吗？有点钻牛角尖了，谢谢大家

joannahope

首先 一般V+ing在与修饰名词连接无逗号的情况下，优先考虑做名词的修饰成分，而且被修饰的名词在逻辑上要是ing形式的动作发出者，如果不是 就是错误的，本题中phenomenon 无法发出occuring 所以这样改是错误的，希望可以帮到你

言熙樾

{，V-ing} 可以做伴随/结果，前面为主系表时还可以做解释说明
这里面occuring也不能表示与主句伴随或者结果，因为这里是对整个主句的一个解释

至于occuring 和 phenomenon搭配如楼上所说

zttttts

这道题的also错在哪呢？是but also一定要连用吗

rubychi

"这里关于explained后面的成分为什么要使用are becoming这个现在进行时的时态呢？

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）"