从gmatclub上扒下来的OG语法题

雨点_

大神们帮忙看一下啊 也有相同的疑惑 但是没找到答案

Prices at the producer level are only 1.3 percent higher now than a year ago and are going down, even though floods I the Midwest and drought in the south are hurting crops and therefore raised corn and soybean prices.

A: than a year ago and are going down, even though floods I the Midwest and drought in the south are hurting crops and therefore raised
B: than those of a year ago, and are going down, even though floods in the Midwest and drought in the south are hurting crops and therefore raising
C: than a year ago and are going down, despite floods in the Midwest and drought in the south, and are hurting crops and therefore raising
D: as those of a year ago and are going down, even though floods in the Midwest and drought in the south hurt crops and therefore raise
E: as they were a year ago and are going down, despite floods in the Midwest and drought in the south, and are hurting crops and therefore raising

the correct anwser is B, because prices can't be compared to a time period(a year ago).

But then i came cross this question(OG16 SC104):
Heating-oil prices are expected to be higher this year than last.
this original sentence is correct, as it compares this year to last(year) and it's logically parallel.

I get rather confused about those two sentences, because i think they are quite the same." Price are higher now than a year ago." and " Price will rise higher this year than last." aren't they? so why can't we just compare NOW to A YEAR AGO just like what we do in the" Heating-oil prices are expected to be higher this year than last.". Is there any reason that i can't use the same comparison structure here?

really need some pointers!thanks

雨点_

自己顶 没有人吗……

emmahiggins09

我也困惑了很久，综合了很多方的解释，也还是不是很清楚，大家一起讨论：

第一句是在比较重点是主语prices ，这从后面 and are going down 也能判断出来。所以可能这里选择补出了those 。但是我觉的不补出也是对的。A不对的原因不是因为没有those 而后 and 后面的 therefore raised 的错误

第二句的比较重点聚焦在时间状语上： this year than last year 。比较发生在状语位置的时候，主语如果相同可以省略，谓语即使时态不相同也可以省略因为时间状语已经给出了比较的对象。

雨点_

emmahiggins09 发表于 2016-4-12 09:02
我也困惑了很久，综合了很多方的解释，也还是不是很清楚，大家一起讨论：

第一句是在比较重点是主语prices ...

却是一直在看那个比较的点没怎么注意后面部分  主要是看了og上的解释是在说比较的错误 然后就疑惑了

贾贾Van

同觉得比较是对的，只是后面不平行。

ax158214

A. than a year ago 與 than those of a year ago 其實都是正確的,-By RON
然而錯誤的是在後面therefore raised 與 hurting 不平行
B. 正確
C. and are hurting crops and therefore raising 的主語變成 Prices 不合理
D. 沒有higher as 用法
E. 沒有higher as 用法 ; they指代錯誤 ; hurting主語是Prices不合理
考點(解題順序):1. 比較 2. 平行 3. 句意