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

答案：B

专业教师答疑

问题：这题为什么不能选A。图1这个好像就是因为in fact that做原因不够直接，不如直接加名词或者一句话的；所以我感觉B这里不够好。图2这个功能并列，这里是因为not...by...封闭式平行所以前后必须对等吗？因为我感觉但从语义来说，A也算是功能对等。

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问题：请金老师帮忙回答：考点：并列，修饰首先可以看出划线部分是对前句的解释说明，所以划线部分不能是一个完整句子，且which不能指代前面一件事情保留A，B，C 看平行， A :not just because ..but by…不平行 B：not just by the fact that…but by the fact that …并列两个句子 ok C: not just because of …but also because of… 并列两个词组可以看出 B并列了两个句子，C并列了两个词组，这里选B是因为修饰名词（phenomenon）从句优于词组吗？查看答疑

问题：老师可以讲下not only but also的用法？这边是not just？还有C选项because of已平行啊查看答疑

问题：为什么D不行查看答疑

问题：老师，D为什么不对？此处的which不能是指逗号前的这件事吗？a phenomenon 不也是指逗号以前吗？有什么区别。查看答疑

问题：错选了c，老师可以解释一下b和c的语意上的差别吗，b里面phenomenon后面的that从句里面又包含了that从句，觉得表达很繁琐查看答疑

问题：之前的录音辨析B和E的时候，指出E项中‘which’指代不明，还有后面的结构不太平行所以判定不好；但是我当时做的时候，觉得B中的ing形式特别怪，而E意思上能过得去，所以就选了E。这要怎么破？查看答疑

问题：之前做题听录音，说要注意语义上的平行而不是语法上的平行，B是挺平行的，对于一个发生了的现象，但总是感觉are writing高价处方药不太好，所以选了E。求老师解答，谢谢！！查看答疑

问题：觉得d和b都平行，但是b太罗嗦所以杀掉了。。而且我觉得没有那个phenomenon也不影响什么查看答疑

问题：前文里没有出现phenomenon,逗号后面直接跟phenomenon，觉得很奇怪查看答疑

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