GWDTN14 18

18. GWD17-Q18:

Over the course of the eighteenth century, the average output of ironwork tripled as a result of several improvements in blowing machinery and because coal replaced charcoal as the fuel used in the smelting of iron ore.

A.      Over the course of the eighteenth century, the average output of ironwork tripled as a result of several improvements in blowing machinery and because coal replaced charcoal as the fuel used in the smelting of iron ore.

B.       Over the course of the eighteenth century a tripling in the average output of ironwork was due to the replacement of charcoal by coal for the fuel used in the smelting of iron ore, in addition to several improvements in blowing machinery.

C.      With charcoal’s being replaced by coal as the fuel used in the smelting of iron ore and several improvements in blowing machinery, the average output of ironwork tripled over the eighteenth century.

D.      The replacement of charcoal with coal for the fuel used in the smelting of iron ore and several improvements in blowing machinery, 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 the average output of ironwork over the course of the eighteenth century.为啥不选C呢 我觉得A 并列的很有问题啊

A的确很怪，但对于全句划线的题目我多采用排除法。

本题首先排除C，E，因为出现了being这个词，只有在perp+being+passive是being才是有效的，抛开这个不说，C的With charcoal’s being replaced by表达也很有问题，完全可以用With charcoal replaced by....表达啊，独立主格。E就不说了，wich摆在那

D： run-sentence

B：ETS并不认为due to能代替because， 而且表达也不好

不认为A好..但相比之下选了A

选项A无论从逻辑含义还是句子结构都是最好的。

   Over the course of the eighteenth century, the average output of ironwork tripled as a result of several improvements in blowing machinery and because coal replaced charcoal as the fuel used in the smelting of iron ore.

平行对称并不是说形式上一定要是完全一样才叫parallel.选项A中：the average output of ironwork tripled as a result of 。。。。and because。。。是parallel的，因为是解释了triple发生的两个原因。og上记得有个题目和这个类似，大家可以找找看。