请教一道GWD语法题

spoooon

Both the Federal Reserve's decision that borrowing rates be raised, along with investor's speculation that another increase might be on the way, helped bolster the dollar in recent weeks by making deposits more attractive.

A.that borrowing rates be raised, along with investor's speculation that another increase might be on the way, helped bolster the dollar in recent weeks by making

B.that borrowing rates be raised and investors' speculation of possibly another increase on the way helped to bolster the dollar in recent weeks because they made  

C.to raise borrowing rates and investors' speculation that another increase might be on the way helped to bolster the dollar in recent weeks by making  分析C选项

D.to raise borrowing rates, along with investors' speculation that another increase might be on the way, helped bolster the dollar in recent weeks because it made  

E.to raise borrowing rates and investors' speculation of possibly another increase on the way helped bolster the dollar in recent weeks because they made

这道题OA是C

我的问题是 这道题里的两个名词的修饰结构不需要平行吗？我觉得E中名词后面都是用介宾结构更好一点~~我也看过一些解答，但是还是对这里有疑问。

emmahiggins09

这道题，C 和 E 我纠结了很久到现在也不是很确定。

Both A and B helped to bolster the dollars...by making
Both A...and B...helped bolster the dollars because they made deposit more attractive.

我个人感觉还是觉的they 这里的指代还是有点问题的, 可以指代both A and B, 也可能指代dollars (纯属我自己的想法，要是错了求轻拍）
还有个规则就是，一般情况下如果题干里有might 等情态动词的话，在选项里一般不能有其他的副词来替代

医生吃鱼

一、该句平行的核心结构是both decision and speculation。。。，两个动词互相平行，它们的修饰结构可以不平行。

二、E选项有两个主要错误：
1、possibly是副词，不能修饰increase。
2、because从句不如by doing简洁。
     by doing直接解释主句如何发生。该句中by making  deposits more attractive直接解释了helped to bolster the dollar这个动作。