12-Q32:

Prospecting for gold during the California gold rush was a relatively easy task, because of erosion, prehistoric glacier movement, and ancient, gold-bearing riverbeds thrust to the surface by volcanic activity put gold literally within reach for anybody with a pan or shovel.

1. because of erosion, prehistoric glacier movement, and ancient, gold-bearing riverbeds thrust to the surface by volcanic activity put gold literally within reach for
2. because of erosion, prehistoric glacier movement, and volcanic activity that thrust ancient, gold-bearing riverbeds to the surface, and putting gold literally within reach of
3. owing to erosion, prehistoric glacier movement, and volcanic activity that had thrust ancient, gold-bearing riverbeds to the surface, and putting gold literally within reach of
4. since erosion, prehistoric glacier movement, and volcanic activity that thrust ancient, gold-bearing riverbeds to the surface, putting gold literally within reach for
5. since erosion, prehistoric glacier movement, and ancient, gold-bearing riverbeds thrust to the surface by volcanic activity put gold literally within reach of

确认一下这题的答案。好象是E, 但我选D，因为E的句意有问题。没人注意到吗？

in reach of 不是 in reach for

D. 有问题。

D. since E, P, and V. that ..., putting gold with in reach

since 后要接完整句子，而这里 that ... 修饰 volcanic activity, 造成 since 后没有谓语。

E. since E, P, and riverbeds put gold within reach 谓语是 put

D since后面不是完整句子,结构不完整.putting变成状语修饰

E.. 好象最后一个平行有点问题,但相对较弱

请指正

ancient, gold-bearing riverbeds

anciet为什么要用逗号断开啊？逗号能替代and吗？

 这道题目先看划线最后within reach of anybody 意为[ 在某人所及范围]；而reach for用在这里就不达意了；

而because of后面所接部分不能太长；oweing to不常出现，用ing形式不知表达何意；

put这里是（which is）put的省略用法，是修饰volcanic activity ，用逗号隔开就不正点了，而且ing放句为表示伴随结构或伴随结果，这里是不合适的；