Dental caries and gingivitiscan be exacerbated not only by the foods patients eat but also by when thepatients eat them. (A) not only bythe foods patients eat but also by when the patients eat them (B) by not onlythe foods patients eat but also by when the patients eat them (C) not only bythe foods patients eat but also by time when the foods are eaten (D) by not onlythe foods that are eaten by patients but also by the times the foods are eaten(E) (E) not only bywhat patients eat but also by when they eat it
C也对,但E更简洁。问题是E中的they不会指代不清吗?
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