OG-改错-19 有点不明白

birdie

19. In addition to having more protein -than wheat does, the protein in rice is higher quality than that in wheat, with more of the amino acids essential to the human diet.
(A)    the protein in rice is higher quality than that in
(B)    rice has protein of higher quality than that in
(C)    the protein in rice is higher in quality than it is in
(D)    rice protein is higher in quality than it is in
(E)    rice has a protein higher in quality than

上题的正确答案是B，我做错了，选了C。我觉得C答案的语法结构好像没有错啊？要错也是than 后面那个it 应该改成that。
看OG的解释：
In C and D, the comparative structure higher in quality than it is in wheat absurdly suggests that rice protein contains wheat.
似乎是逻辑上出了问题，但是我在选答案的时候并不认为答案C的意思如OG解释的那样会产生歧义。
到底答案C是语法错误呢，还是逻辑错误？怎么看答案C才能看出OG所说的歧义呢？

tocean0222

1、从than wheat does，句子的主语应该和wheat平行，所以只能是rice而不是protein；
2、如果用B的话，it指带前面的protein in rice，而在wheat里，所以引起歧义；

tony9721

我是这样理解的,
你看句子的前半句也就是in addition to having more protein -than wheat does,如果要想使逻辑主语具有可以性,那么后面的一个句子就应该是以rice开头的,因为这样才是前一个句子的wheat 和rice的比较,因此A,C,D的主语都不对,排除
E的a protein 不爽,所以B

mzyzhu

看看这样是不是好理解一些。

原句：in addition to doing..., 主句划线。所以（1）主句一定要不出主谓结构；（2）doing的逻主一定要是主句主语。由于in addition to 没划线，因此主句主语必须迁就doing 后面表达的逻辑意思。由于你看到是something和wheat 比protein.所以主句主语在此就只能是rice了。因此ACD都不能选。B 和E一直到than都没有错。但是E在than 后面直接接wheat,有可能引起歧义：到底是rice跟wheat比protein还是....所以选B.

birdie

哦，原来是酱紫地。偶忘了看划线部分前面的那个than wheat does了，还是练习得不够呀。谢谢两位T-GG!