According to a recent study of consumer spending on prescription medications, increases in the sales of the 50 drugs that were advertised most heavily accounts for almost half of the $20.8 billion increase in drug spending last year, the remainder of which came from sales of the 9,850 prescription medicines that companies did not advertise or advertised very little.


heavily accounts for almost half of the $20.8 billion increase in drug spending last year, the remainder of which came

heavily were what accounted for almost half of the $20.8 billion increase in drug spending last year; the remainder of the increase coming

heavily accounted for almost half of the $20.8 billion increase in drug spending last year, the remainder of the increase coming

heavily, accounting for almost half of the $20.8 billion increase in drug spending last year, while the remainder of the increase came

heavily, which accounted for almost half of the $20.8 billion increase in drug spending last year, with the remainder of it coming

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题目分析：
本题属于GMAT句子改错考试中的简单题，有三个选项可以通过语法知识直接排除。但是，剩下的两个选项可能会较难以排除。

选项分析：

A选项：the remainder of which是定语从句（有which的都是定语从句）。定语和状语，是英语的修饰语，需要就近修饰一个名词或动词。本选项中，距离the remainder of which最近的名词是drug spending。但是，come的逻辑主语应该是increase，即，其余的上升来自于9850种药。另外，一般现在时accounts应改为过去式accounted。

B选项：分号通常连接两个分句，即，前后均需要是完整的句子（虽然个别的时候（一般为连接平行对象时），分号能与逗号相互替换，但是本质上，分号应连接两个独立的分句）。

C选项：Correct. 本选项在逻辑和语法上均是正确的。the remainder of the increase coming from sales of the 9,850 prescription medicines是独立主格结构，做状语。

D选项：本选项没有谓语动词。

E选项：本选项没有谓语动词。

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