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.
A because of erosion ,prehistoric glacier movement, and ancient, gold-bearing riverbeds thrust to the surface by volcanic activity put gold literally within reach for
B 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
C 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
D since erosion, prehistoric glacier movement, and volcanic activity that thrust ancient ,gold-bearing riverbeds to surface, putting gold literally within reach for
E since erosion, prehistoric glacier movement, and ancient, gold-bearing riverbeds thrust to the surface by volcanic activity put gold literally within reach of
Prospecting for gold was a task, because of...
A中because of 后面加了句子,wordy
B中结构复杂,读起来有一种断了气还没读完的感觉,而且putting没有动作的发出者
C中had thrust时态用错,putting也没有动作发出者
D中since从句没有谓语动词
选择E,thrust to做后置定语