请教关于which就近修饰的题~

晕了，那在实战中是用就近原则还是跳跃性啊？

具体跳跃性的原则是什么，总不能都跳啊，否则就会修饰不清了呀，请NN不吝赐教，呵呵。。。

我在破解PREP语法分析中有一题：

More than 300 rivers drain into Siberia's Lake
                        Baikal, which holds 20 percent of the world's fresh water, more than all the North American Great Lakes combined.

A)More than 300 rivers drain into Siberia's Lake
                    Baikal, which holds 20 percent of the world's fresh water, more than all the North American Great Lakes combined（正确答案）

C) Siberia’s Lake
                Baikal, with more than 300 rivers draining into it, it holds more of the world's fresh water than all that of all the North American Great Lakes combined, 20 percent.

D) While more than 300 rivers drain into it, Siberia's Lake
                Baikal holds 20 percent of the world's fresh water, which is more than all the North American Great Lakes combined.

E) More than all the North American Great Lakes combined, Siberia's Lake
                    Baikal with more than 300 rivers draining into it, holds 20 percent of the world's fresh water.

其中对D的解释是：which引导的非限定性定语从句就近修饰fresh water, 而从逻辑上应该修饰20 percent，所以错。

想起这题我就云里雾里了，呵呵，请NN伸出上帝之手吧，解救困惑的羔羊啊……

没有人知道吗……

这个问题相当困扰了……

我是这样理解的:

which是就近指代,但是D是which were,说明which指代的是复数,而前面唯一的复数是letters....

这题是个争议题，前人的讨论也集中在A和E上

我觉得A是被动，E是主动，ETS认为主动>被动……（只有这一点好像不太说的过去）

但这题答案的确是E

有人google出来的原文：

Dickinson's surviving letters to Susan, which began ardently a few years before Susan's marriage and continued almost until the poet's death in 1886, outnumber her letters to anyone else.

以下是引用shiyewuxian在2009-7-12 12:12:00的发言：
1. Emily Dickinson’s letters to Susan Huntington Dickinson were written over a period beginning a few years before Susan’s marriage to Emily’s brother and ending shortly before Emily’s death in 1886, outnumbering her letters to anyone else.
A. Dickinson were written over a period beginning a few years before Susan’s marriage to Emily’s brother and ending shortly before Emily’s death in 1886,     outnumbering
B. Dickinson were written over a period that begins a few years before Susan’s marriage to Emily’s brother and ended shortly before Emily’s death in 1886,     outnumber
C. Dickinson, written over a period beginning a few years before Susan’s marriage to Emily’s brother and that ends shortly before Emily’s death in 1886 and     outnumbering
D. Dickinson, which were written over a period beginning a few years before Susan’s marriage to Emily’s brother, ending shortly before Emily’s death in 1886, and     outnumbering
E. Dickinson, which were written over a period beginning a few years before Susan’s marriage to Emily’s brother and ending shortly before Emily’s death in 1886, outnumber
答案是E，我不明白为什么“which"没有错，按照就近修饰的原则，Dickinson作为从句的主语是不对的，主语应该是letters啊，请NN们指教……

which不能指代人，所以不能指代Dickinson