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)
(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. 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.
我主要是对于最后这句话不明白。og说改变了顺序,这样为什么错?
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