OG93 一个没有被提到的问题

93. It is well known in the supermarket industry that how items are placed on shelves and the frequency of inventory turnovers can be crucial to profits.

(A)  the frequency of inventory turnovers can be

(B)  the frequency of inventory turnovers is often

(C)  the frequency with which the inventory turns over is often

(D)  how frequently is the inventory turned over are
     often

(E)  how frequently the inventory turns over can be

Choice E, the best answer, grammatically and clearly makes the statement "x and y can be crucial," in which x and y are parallel clauses, each introduced by the conjunction how. This parallelism is preferable to the use of the noun phrase the frequency in A, B, and C.
    Furthermore, the frequency of inventory turnovers in A and B is less clear than how frequently the inventory turns over(动词比名词说的清楚).
    In B and C is often does not agree with the plural compound subject.
    Choice D ungrammatically reverses the subject-verb order with is the inventory.(托福语法错误)

文中的can是不能随便就省略掉的.

不明白的就是纳闷这个D的解释！请老师们解释一下这个托福语法错误到底是什么呢？

另外，这个地方难道不能解释为“倒装”吗？

D;首先是语序问题，楼上已经说明

其次，often也是多余的；

再次，are 用在这里也有点莫名其妙，are 的主语是哪个？并且，为什么是复数。

总之，错的很多。

不是倒装不倒装的问题，how引导的从句作主语或介词宾语了，主谓都要颠倒的。

就像2楼说的，除非它是一个独立的句子（表疑问），其他的成分都是要S+V,你看看G61里的how引导的就是这样的。

To：well4eva

我大概明白您的意思了！绝对不是疑问句，所以那这个地方是什么句子？

总不能是陈述句吧？！

另 to： wnlovess

您是不是想说不是倒装不倒装的问题，how引导的从句作主语或介词宾语了，主谓都要（是不能）颠倒的。不然您说的话逻辑是有问题的啦！呵呵

最后，谢谢各位老师的帮助！我的语法基础基本为零。惭愧的很！绝望ing！！！！（就本人的水平，可能不适合英语考试，但是我想试试。。。。。。）