GWD几道没有讨论贴的题目咨询,万谢

21-Q10:

Researchers in Germany have unearthed 400,000-year-old wooden spears from what it appears was an ancient lakeshore hunting ground as stunning evidence of human ancestors who systematically hunted big game much earlier than believed.

1. it appears was an ancient lakeshore hunting ground as stunning evidence of human ancestors who
2. it appears had been an ancient lakeshore hunting ground and stunning evidence that human ancestors
3. appears was an ancient lakeshore hunting ground and is stunning evidence that human ancestors
4. appears to be an ancient lakeshore hunting ground, stunning evidence that human ancestors
5. appears that it is an ancient lakeshore hunting ground, stunning evidence of human ancestors who

答案是D,这里不明白spear from what appears to be是个什么结构,what是什么作用，为何from what it appears to be就是错误的呢?

21-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.

1. 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.
2. 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.
3. 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.
4. 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.
5. 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.

 答案是C,感觉With charcoal’s being 是个错误的结构呀...

21-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.

1. 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.
2. 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.
3. 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.
4. 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.
5. 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.

 答案是C,感觉With charcoal’s being 是个错误的结构呀...

Q10:from是介词，后面跟名词或者具有名词功能的从句。所以这里from后面跟的应该是what从句。既然是从句就要有自己的主位宾。what从句里面，what本身就是主语，不能再添加一个it。而appear是谓语，appear to do。

Q18: C答案里being是动名词，因此 charcoal’s being replaced 没有错。with引导的是独立主格结构。A里面，as a result of several improvements and because coal replaced，前面是短语后面是句子，不能平行并列。B里面due to和in addition都不好，而且tripling也不如动词triple。D里面replacement不如replace，而且the replacement特指和several improvements泛指不能并列。E没有主句谓语。

Q38同问