[求助]GWD语法题一道

24. GWD25-Q24

Although improved efficiency in converting harvested trees into wood products may reduce harvest rates, it will stimulate demand by increasing supply and lowering prices, thereby boosting consumption.

A.      in converting harvested trees into wood products may reduce harvest
        rates, it will stimulate demand by increasing supply and lowering prices, thereby boosting

B.       in converting harvested trees into wood products may reduce harvest
        rates, demand will be stimulated because of increasing supply and
        lowering prices, which boost

C.      of converting harvested trees into wood products may reduce harvest rates, it will stimulate demand by increasing supply and lowering prices,
        which boosts

D.      of harvested trees being converted into wood products may reduce
        harvest rates, it will stimulate demand, because it will increase supply
        and lower prices, thereby boosting

E.       when harvested trees are converted into wood products may reduce harvest rates, demand will be stimulated because of increasing supply
        and lowering prices, which boost

参考答案是B，可是为什么呢，B是被动语态，其他的为什么不对呢，请高手指点。谢谢

A B 不确定。。

C efficiency of doing 不好    后面supply and prices, which boosts 不对

D efficiency of doing 不好    有because 又有thereby，因为所以加一起了

E when不对

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我认为这题选A.

撇开被动不说,B答案的because of令句子对原句意的表达有误.

原文是想说虽然efficiency怎么怎么样不好,可是它也通过提高供应量和降低价格刺激了需求.Because of割裂前后句子的逻辑关系,虽然同样把需求量被刺激归结为价格和供应,却没有把价格和供应与efficiency联系起来,改变了句子原意和重心.

而且boost的逻辑主语是demand被刺激,B答案中的which就近修饰supply and prices会造成歧义.

所以这题我很肯定选A.