885题A-7提问

usasky

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E，it指向不明啊。为什么不是C呢？

dandan74

It refers to "what".

usasky

WHAT是复数怎么办？

renprince

c是被动形式，不如e的直白，简洁

lemonee

it refer to what clause,总是单数。

givemeahome

it在此的用法我没见过，一般what从句用that指代；
it这样的用法大家别处见过吗？

lizhihuantu

"time when" is redundant
"by what... and by when" is parallel

superstar

"time    when"    is    redundant，C肯定应该排除


其实E也不对，把句子的意思改变了，题目是the foods，不完全等于what    patients    eat    吧~

leeon

it refer to what clause,总是单数。

代词能指代句子吗？

leeon

E is best. 这里it指what。这题的依据主要是平行，其它四个选项都不如E好。
C 虽不错，但没有 E 简明 , 且被动不如主动。
what patients eat  和  when they eat it 在此 都是名词性从句
what patients eat 相当于 food; when they eat it 相当于 time
it 指代 名词性从句 what patients eat
E的 it 不能省，eat及物
not only by what patients eat but also by when they eat it= not only by the food that patients eat but also by the time at which they eat it

这是我翻出的大全简注；觉得有问题，还有A错在什么地方。