请教两个问题！

yuchuang1

7.     Dental caries and gingivitis can be exacerbated not only by the foods patients eat but also by when the patients eat them.

(A) not only by the foods patients eat but also by when the patients eat them

(B) by not only the foods patients eat but also by when the patients eat them

(C) not only by the foods patients eat but also by time when the foods are eaten

(D) by not only the foods that are eaten by patients but also by the times the foods are eaten

(E) not only by what patients eat but also by when they eat it

答案为E,我的疑问是it无指代，C还好些

11.   Marketing researchers have found that, because many residents of the Southeast do not share the same ethnic heritage as Northeasterners, the two varieties of commercially prepared coleslaw most popular in New York City and Boston are virtually ignored by consumers in Richmond and Raleigh.

(A) because many residents of the Southeast do not share the same ethnic heritage as

(B) because many residents of the Southeast do not share the same ethnic heritage with

(C) because many residents of the Southeast do not have the same ethnic heritage as

(D) due to many residents of the Southeast not sharing the same ethnic heritage with

(E) whereas many residents of the Southeast do not share the same ethnic heritage as

第二个问题答案是C，我的疑问是此中Share是语法错误还是逻辑错误，请帮忙解释。

LES

第7题：C选项 time 后面有从句起限定作用，所以应该前面要加 the。
             E选项 it 指代 What patients eat，（在平时的语法上应该是没有问题，但是GMAT语法好像说 it 不可以指代整个
                      句子，不知这里算不算指代整个句子？请高人来指点指点)
                      另外E选项的并列结构对称性最好。

第11题：A选项里的share 是语法和逻辑均错，应该是share with sb， 但B选项虽然更改了语法错误，但是这里share with
        的用法与未划线部分逻辑搭配错误，所以C好。     

yuchuang1

谢谢，你的解释精辟！