新PREP2：177 正确答案也有小问题？

177.          (T-4-Q12)
                逻辑含义/

For the farmer who takes care to keep them
            cool, providing them with high-energy feed, and milking them regularly, Holstein cows are producing an average of 2,275 gallons of milk each
            per year.

A. providing them with high-energy feed, and milking them regularly, Holstein cows are producing

B. providing them with high-energy feed, and milked regularly, the Holstein cow produces

C. provided with high-energy feed, and milking them regularly, Holstein cows are producing

D. provided with high-energy feed, and milked regularly, the Holstein cow produces

E. provided with high-energy feed, and milked regularly, Holstein cows will produce

我的问题：

Each 不是说明主语应该用单数吗？

通过逻辑含义直接排除A,B,C，剩下D,E。

因为原句中，没划线的部分是： an average of 2,275 gallons of milk each
                per year.

我看到这里有 each，应该是说 每头牛 每年 平均产奶2275 gallons，所以觉得主语应该是单数啊？

就选了D的：the Holstein cow produces

（我知道E的 Holstein cows will produce 符合前面的For the farmer who takes care to keep them
                    cool,）

但这里问什么后面 用 了each ，主语却用 复数呢？不是应该与后面的 each 保持一致吗？

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下面是我在老外网站上看到的对5个选项的分析，给大家参考

（但没找到对这个 each 问题的解释。请NN 指点，谢谢。） 

So, A should say "providing them with high energy feed, and milking them regularly, Holstein cows are producing " This makes a list out of "to keep," "providing," and "milking" which is a list, but it fails the parallelism test. Also, the verb tense "are producing" is wrong - if the farmer takes care of them, they will respond a certain way. Eliminate A. (Note that I added a comma missing from the original text, above.)

B also has parallelism issues (providing, milked), as does C (provided and milking). D and E have parallelism with provided and milked, but they still don't match "to keep." And this is where this one gets really hard. Most people will want to keep this as a list of three things, with those three words properly parallel - and that would be a good way to write the sentence, but they haven't given us that option.

If we lopped off that opening clause, we'd have "Provided with high energy feed, and milked regularly, Holstein cows..." That's okay. Then they add this separate clause out front (the "For the farmer" bit) and this is what makes it sound bad b/c we want to combine that opening clause with the provided and milked piece. Since we don't have that as an option, we're forced to look at them as separate items (though we do still want parallelism between provided and milked).

Then, we're just left with "produces" vs. "will produce" since D and E both use provided and milked. The sentence begins "For the farmer who takes care to keep THEM cool" so we have to use plural for the cows. Answer D uses singular, so E is the answer.

这里为什么后面 用 了each ，主语却用 复数呢？不是应该与后面的 each 保持一致吗？

先谢谢了！

谢谢LS回复，

可是

E. provided with high-energy feed, and milked regularly, Holstein
            cows
            will produce an average of 2,275 gallons of milk each
            per year.

E的主语：是 cows，是复数，

因此疑问：each为什么可以搭配复数主语 cows。。。

each 一般都是搭配单数形式的主语吧？

AlienX，能详细解释下吗？

这句话每个单词 我都看了好多遍了。。。你要说的意思是？

an average of 2,275 gallons of milk each
            per year.

这句话的意思不就是说： 每头牛 每年 平均产奶2275 gallons ？

如果 each 修饰 per year，那不是 含义重复了吗？

each：每一。。。

per：每一。。。；

请指点，谢谢！

复数主语+each+复数动词，这个结构没有问题，如：

1) we each are reading....，主语是we，后接复数动词

2) each of us is reading...., 主语是each,后接单数动词

所以E肯定没有问题。

但是至于D错，我觉得是因为，前面提到了them, 所以不能用单数cow。

each就是个修饰成分而已，不需要和前面的主语一致

这么说吧，一群牛每只每年能产多少多少奶，这么表达逻辑是通的吧，而上面那个句子也是想表达这么个意思

楼上说这里的each是同位语我不太同意，这里的each应该是个副词，表示 每 的意思

当each做名词成分譬如独立主格时，后面的谓语要单数