217. Although some officials noted that using machines for farming in China costs more than traditional hand cultivation, the mechanization of farming in the village of Long Bow doubled the corn yield while the previous year’s costs were cut in half.

(A) mechanization of farming in the village of Long Bow doubled the corn yield while the previous year’s costs were cut in half

(B) mechanization of farming in the village of Long Bow doubled the corn yield while cutting costs to half those of the previous year

(C) mechanization of farming in the village of Long Bow doubled the corn yield as cost were cut to half of the previous year’s

(D) farming mechanization in the village of Long Bow doubled the corn yield as it cut in half the previous year’s costs

(E) farming mechanization in the village of Long Bow doubled the corn yield while costs were cut to half that of the previous year

答案是B，看了若干种解释，说A不对，是因为the previous year’s costs were cut in half意思错：不应是先前年份的成本被砍掉一半, 而是成本消减到只有先前年份的一半。这个可以理解，可是说B对，却实在不明白，B中的while后面不是一个完整的句子，可是如果说B是省略了前面的主语mechanization，那这个句子就变成了while mechanization cutting...可这也还是不是一个正确的句子呀，如果说是还省略了系表动词，但前面的doubled的那个分句中也没有对应的系表动词，那怎么能省略的呀？盼望高人解释一下。

还有一题，大全105，（老的885里面的E-08）

1.        Among the emotions on display in the negotiating room were anger for repeatedly raising the issue over and over again and preventing the raw wounds from earlier battles from ever beginning to heal.

(A) were anger for repeatedly raising the issue over and over again and preventing the raw wounds from earlier battles from ever beginning to heal

(B) was anger for repeatedly raising the issue and preventing the raw wounds from earlier battles from ever beginning to heal

(C) were anger over repeatedly raising the issue and preventing the raw wounds from earlier battles to begin healing

(D) was anger about the issue, which was raised over and over, and preventing the wounds from earlier battles, still raw, to begin healing

(E) were anger about the issue, which was raised repeatedly, and preventing the raw wounds from earlier battles to begin to heal

这题的主语到底是什么？如果是the emotions，为什么后面谓语动词是单数呢？Among+复数+动词，好象没有要求动词是单数呀，查了半天只有only among+复数才要求后面的动词是单数，另外，preventing the raw wounds from earlier battles from ever beginning to heal，这个应该怎么翻译比较合适一些？请各位NN指教一下了.

1. while + doing something 固定用法

但是这个不要求主语跟主句主语一致吗？谁来回答一下

2. 倒装，句子的主语是anger

among ..... + was + anger

anger was among...

选B吧

mechanization of farming in the village of Long Bow doubled the corn yield while cutting costs to half those of the previous year

我开始想错了，我想成mechanization of farming 不能cutting costs了，主语不一致，所以一开始没有选B

不过既然这个可以double yield也可以cutting costs.........