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
解释中 In B and C is often does not agree with the plural compound subject.
frequency（频率）应该agree with "is"啊？？？gwd4-18
Q18:
Yellow jackets number among the 900 or so species of the world’s social wasps, wasps living in a highly cooperative and organized society where they consist almost entirely of females—the queen and her sterile female workers.
wasps living in a highly cooperative and organized society where they consist almost entirely of
wasps that live in a highly cooperative and organized society consisting almost entirely of
which means they live in a highly cooperative and organized society, almost all
which means that their society is highly cooperative, organized, and it is almost entirely
E. living in a society that is highly cooperative, organized, and it consists of almost all
这题很奇怪，我可能思路有问题，请教：我做的时候还特意注意了a 中的代词they, 我觉得这里用they 才对呢，因为它指代wasps呀！这里讲的不是wasps包括那些的吗? 比如说: 我们几个学生由中国人,美国人组成?
b 里面是society由那些组成, 也讲的通,不过好像我的更通?
怎么回事呀? 请教? | 
