请教OG12中的SC 83题（非解释答案）

frankning007

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

(B) 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

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

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

(E) which occurred not just because of more expensive drugs but because doctors have also written
答案：B

问题：OG中关于D、E选项的解释主要是说未遵循平行规则（not parallel），我想问一下，如果遵循了平行规则，这两个选项就是对的吗？我觉得在这用which从句来引导，which指代不明，可能指代的是整个现象（ a mere two dozen products accounted for half the increase in spending on prescription drugs），也可以指代前面的drugs。再引申一下，which的指代是不是仅限于前面紧跟着的那个主语或者宾语，不能指代整个句子？

谢谢！

xyh133

which不能指代前面整个句子，它是非限定性的，指代前面的词必须要加逗号（指代前面整句话只能用doing形式或新名词）

魏小妞要出国

同意LS的，另外GMAC的答案总是倾向于同位结构（个人感觉）

nemiah

which没有明确指代对象

云南

选项D和E中的not just but also 用法不对

踏雪无痕1989

我觉得which是就近指代哈，所以指代对象出问题了，而前面的名词可以很好的指代前面提到的事情