这两题答案为何截然不同？

38.According to a recent study, the elderly in the United States are four times more likely to give regular financial aid to their children as to receive it from them.
(A) the elderly in the United States are four times more likely to give regular financial aid to their children as
(B) the elderly in the United States are four times as likely to give regular financial aid to their children as it is for them
(C) the elderly in the United States are four times more likely to give regular financial aid to their children than
(D) it is four times more likely for the elderly in the United States to give regular financial aid to their children than they are
(E) it is four times as likely that the elderly in the United States will give their children regular financial aid as they are
the key:C。

42.According to a survey of graduating medical students conducted by the Association of American Medical Colleges, minority graduates are nearly four times more likely than are other graduates in planning to practice in socioeconomically deprived areas.
(A) minority graduates are nearly four times more likely than are other graduates in planning to practice
(B) minority graduates are nearly four times more likely than other graduates who plan on practicing
(C) minority graduates are nearly four times as likely as other graduates to plan on practicing
(D) it is nearly four times more likely that minority graduates rather than other graduates will plan to practice
(E) it is nearly four times as likely for minority graduates than other graduates to plan to practice

the key:C

i think.

这两题的不同用法问题不出在more...than...和as ...as...上，其实这两种表达方式都是没有错误的。

1. 首先根据逻辑意思判断到底是应该用more than 还是 as as。原句里用哪个，在没有逻辑冲突的情况下，优先使用哪个。

2. 42题中放弃了more than而选择as as应该是由于有more than的选项有语法错误。

我查了字典，likely的用法是，be likely to do/be sth。A选项中，be likely in doing应该是放弃的原因。B选项的比较对象不平行。所以只能放弃more than的用法而选择as as了。

open to discuss...

先谢了，那么38题b选项错在哪里呢？尽管我读起来也感觉不对，但说不出哪里不对

as后it is for them to 与前the elderly are likely to不匹配。them指代不清their children or the elderly

LZ下个大全注释。大部分问题都能解决。