In 2000, a mere two dozen products accounted for half the increase in spending on prescription drugs, a phenomenon that is explained not just because of more expensive drugs but by the fact that doctors are writing many more prescriptions for higher-cost drugs.


a phenomenon that is explained not just because of more expensive drugs but by the fact that doctors are writing

a phenomenon that is explained not just by the fact that drugs are becoming more expensive but also by the fact that doctors are writing

a phenomenon occurring not just because of drugs that are becoming more expensive but because of doctors having also written

which occurred not just because drugs are becoming more expensive but doctors are also writing

which occurred not just because of more expensive drugs but because doctors have also written

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题目分析：
本题中原文的划线部分是整个主句的同位语，(D)(E)两个选项是非限定性定语从句，只能就近修饰一个名词。

选项分析：

A选项：not…but…是平行制造者，它们连接的两者需要在语法上平行，即，not by…but by…或not because of…but because of…。本选项中它们连接的两者不平行。

B选项：Correct. 本选项在语法和逻辑上均是正确的。

C选项：because of是介词，其身后的 drugs that are becoming more expensive和doctors having also written many more prescriptions for higher-cost drugs均为名词短语，这两个名词短语的核心词分别是drugs和doctors。在逻辑上，原因应该是“药物变贵”和“医生开处方”这两件事，而不是药和医生这两个名词，因此本选项是错误的。

D选项：which occurred是非限定性定语从句，就近修饰先行词prescription drugs，在逻辑上，能被解释的肯定是“一个现象”而不是一种药。

E选项：which occurred错误同(D)。

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