求教OG上两道关于平行&比较的题！！

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第一道题：
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 prescription for higher-cost drugs.

Correct answer: 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

求教：平行结构为not just by...but also by 我当时一看不是not only..but also就没选，然后看了看资料，上面说还有一种是not...but...,如果两个都加by我可以理解，但是一个加上just，一个加上also我就不太懂了，不应该是加上一样的么？？

第二道题：
according to recent studies comparing the nutritional value of meat from wild animals and meat from domesticated animals, wild animals have less total fat than do livestock fed on grain and more of a kind of fat they think is good for cardiac health.

Correct answer: wild animals have less total fat than livestock fed on grain and more of a kind of fat thought to be

疑问：之前看到大神的语法资料，说主语比较 A do sth than B do;  宾语比较：  A do C1 than do C2.
题目应该是wild animal和livestock比脂肪少，那应该是主语比较吧？为什么答案省略了do？不会有歧义嘛？？？

感谢！！！！！！

Fiona09

不是NN，俺只会解答LZ的第一个问题。

not only... but also和not just...but also, 都是表示递进关系，意为“不仅/不但……而……”。 其后所连接的词或短语必须严格对等，像LZ po的句子就是两个方式状语的对等，not just by...but also by。

值得一提的是，not only... but also和not just...but also，两个but后面的also都可省略举个例子，I can not just drive but repair a car. 我不仅会开车，还会修车。

其实还有别的变体，如not merely/not simply/not solely...but also...也都是一样的用法。

不过，LZ提到的not...but并不表示递进关系，意为“不是……而是……”

希望对LZ有帮助~~

VincentFSJ

not only……but also不要记那么死，but （also）就可以表达递进了，还可以表示转折，gmac常挖的坑；还有倒装的问题，搜一搜就知道了；

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Fiona09 发表于 2016-9-27 16:15
不是NN，俺只会解答LZ的第一个问题。

not only... but also和not just...but also, 都是表示递进关系，意 ...

好的好的！！！谢谢啦！！！