Over the course ofthe eighteenth century, the average output of ironwork tripled as a result ofseveral improvements in blowing machinery and because coal replaced charcoal asthe fuel used in the smelting of iron ore.
And并列，功能相同
A. Over the course of the eighteenthcentury, the average output of ironworktripled（动词）as a result of several improvements in blowingmachinery andbecause coal replaced charcoal as the fuel used in the smelting of ironore.
B. ！Over the course of the eighteenth century a tripling in the average output of ironwork was due to the replacementof charcoal by coal for the fuel used in the smelting of iron ore, in addition to severalimprovements in blowing machinery.
C. With charcoal’s being replaced by coal as the fuel used inthe smelting of iron ore and several improvements in blowingmachinery, the average output of ironwork tripled over the eighteenth century.
D. The replacement of charcoal with coalfor the fuel used in the smelting of iron ore and several improvements in blowingmachinery, the average output of ironwork tripled over the eighteenth century.
E. Charcoal being replaced by coal as the fuel used in the smelting of iron ore, and several improvements in blowing machinery, which tripled theaverage output of ironwork over the course of the eighteenth century.
and because, 怎么看怎么觉得A不顺，and前后也不对称啊？？作者: verylotus 时间: 2009-11-10 10:32
前两天做到这条争议题，看帖看到要吐血了，好像到现在还是没有公认的答案吧。。。大多数人支持选A。。。。 原因 as a result of引导的原因状语 与because引导的原因状语从句都属状语，是可以并列的。。。作者: fierce 时间: 2009-11-10 11:37
我觉得是不能说a tripling吧