请教gwd一题~

kudoucliff

Q16:
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
   答案是E，但是从平行结构上来说不是应该erosion, prehistoric glacier movement and volcanic activity并列嘛？
   

spz316

LZ陷进去了，这道题的其他错误选项的致命错误在于句子机构，而不是平行。
A,because of 后面不能跟句子
B，and putting ，and后面的句子，没有主语，没有谓语
C,同上
D，since 后面+完整的句子，但是这个选项没有谓语

kudoucliff

谢谢啦，看来平行应该放在第二位来考虑，谓语才是第一位