[求助]大全445

1.        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）

(E) how frequently the inventory turns over can be

两个疑问：

1、这里turn over巍什么不用被动形式，是固定的用法吗？

2，这里D改成how frequently the inventory turn over are often对不对，主要是这里的are对不对，还是应该用is

谢谢！

turn over是固定用法

turn over
v.
打翻, 营业额达到, 周转, 移交给, 反复考虑, 翻身, 折腾, 翻阅

这里是“周转”的意思

红线部分是主语，故主谓一致，应该用复数形式；D主要问题还是因为不应该用被动语态，且often多余

此题解法：

ABC中用frequency违反了平行原则；BC中is导致主谓不一致，故错；D错用被动语态，often多余