238. 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 答案选e, 但是我总觉得it的指代不太明确,请各位指点:) 247. Distinguished architecture requires the expenditure of large sums of money, even if it is by no means certain that the expenditure of large sums of money produce distinguished architecture (A) even if it is by no means certain that the expenditure of large sums of money produce (B) even if it is by no means certain that the expenditure of large sums of money will produce (C) even though there is no certainty that the expenditure of money in large sums produces (D) even though it is by no means certain that the expenditure of large sums of money produces (E) though there is no certainty as to the expenditure of money in large sums producing 答案选d,我选的是B, 我觉得似乎b中的事态will…表达更准确,另外请问even if 与even though的区别。