7. Many investors base their choice between bonds and stocks on comparing bond yields to the dividends available on common stocks.
(A) between bonds and stocks on comparing bond yields to
(B) among bonds and stocks on comparisons of bond yields to
(C) between bonds and stocks on comparisons of bond yields with
(D) among bonds and stocks on comparing bond yields and（C）
(E) between bonds and stocks on comparing bond yields with
答案选C，我想请教的是，为什么用comparisons而不用comparing，我觉得comparing更好一些啊。
我想是这样的首先on是个介词后面要跟名词，comparison本身就是一个名词，而comparing是动名词，是由动词+ing形式演变过来的具有名词性质的词，与纯粹的名词是有区别的。
另外，记得在新东方的语法课上老师说过，在GMAT考试中，当需要一个纯粹的名词时（此处需要），名词优于动名词。而动名词主要是用在做方式状语的时候，比如 By installing this software, we can...这里的installing 就不能用installation,因为此句要表达的意思是通过安装这种软件这个方法，我们就可以如何如何
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