GMAT语法改错的难度一方面来自题干，另一方面来自选项，因为我们要依靠选项之间的差别来获得信息、寻求提示，其实这就反映了GMAT语法改错答案的特点--永远只有相对正确而不存在绝对正确。接下来小编就给大家介绍一下GMAT语法题，希望对大家备考GMAT语法考试有帮助。
94. Heating-oil prices are expected to be higher this year than last because refiners are paying about $5 a barrel more for crude oil than they were last year.
(A) Heating-oil prices are expected to be higher this year than last because refiners are paying about $5 a barrel more for crude oil than they were
(B) Heating-oil prices are expected to rise higher this year over last because refiners pay about $5 a barrel for crude oil more than they did
(C) Expectations are for heating-oil prices to be higher this year than last year’s because refiners are paying about $5 a barrel for crude oil more than they did
(D) It is the expectation that heating-oil prices will be higher for this year over last because refiners are paying about $5 a barrel more for crude oil now than what they were
(E) It is expected that heating-oil prices will rise higher this year than last year’s because refiners pay about $5 a barrel for crude oil more than they did
答案解析如下：
(A)Heating-oil prices are expected to be higher this year than last because refiners are paying about $5 a barrel more for crude oil than they were
【正确】 “last”和“this”是平行的，“last”是“last year”省略后的结果，将省略部分补齐之后，比较句式为“Heating-oil prices are expected to be higher this year than(it was)last(year)”，本质上是“Heating-oil prices are expected to be”和“it was”之间的比较，因此本选项正确使用了“more……than……”的比较句式。
【错误】 供暖用油的价格预期今年会比去年更高，因为炼油厂为每桶原油在比上一年多支付5美元。
(B)Heating-oil prices are expected to rise higher this year over last because refiners pay about $5 a barrel for crude oil more than they did
【错误】 比较结构：如果将两个对象进行比较，“more”应和“than”搭配使用，而不是和“over”。
(C)Expectations are for heating-oil prices to be higher this year than last year's because refiners are paying about $5 a barrel for crude oil more than they did
【错误】 比较结构：比较结构中，比较对象须平行可比，本选项中“this year”(时间状语)和“last year's”(“去年的(油价)”，名词性结构)不平行，无法构成平行可比的比较句式。
(D)It is the expectation that heating-oil prices will be higher for this year over last because refiners are paying about $5 a barrel more for crude oil now than what they were
【错误】 比较结构：本选项使用了“more……than……”引导的比较句式，比较句式的本质是两个平行可比的主谓结构。本选项中“ refiners are paying about $5 a barrel more for crude oil now than what they were”的两个主谓结构“refiners are paying”(一
般的主谓结构)和“what they were”(“what”引导的从句)语法结构不一致，无法平行可比。
(E)It is expected that heating-oil prices will rise higher this year than last year's because refiners pay about $5 a barrel for crude oil more than they did
【错误】 比较结构：见(C)。
【最优解题思路推荐】
只有(A)选项使用了正确的比较结构，遵守了“比较对象平行可比”的原则，因此选择(A)。
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