请问OG第109题

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requires of both public and private employers that pay be the same for jobs historically held by women as for jobs requiring comparable skill that are usually held by men.

(A)     that pay be the same for jobs historically held by women as for jobs requiring comparable skill that are

(B)     that pay for jobs historically held by women should be the same as for a job requiring comparable skills

(C)     to pay the same in jobs historically held by women as in jobs of comparable skill that are

(D)     to pay the same regardless of whether a job was historically held by women or is one demanding comparable skills

(E)         to pay as much for jobs historically held by women as for a job demanding comparable skills

Choice A is best. In choice B, should is illogical after requires, or at least unnecessary, and so is better omitted; in choices B and E, job does not agree in number with jobs; and in choices B, D, and E, the wording illogically describes the comparable skills rather than the jobs as being "usually held by men." Choices C, D, and E produce the ungrammatical construction requires of... employers to pay, in which of makes the phrase incorrect. In C, the use of in rather than for is unidiomatic, and jobs of comparable skill confusedly suggests that the jobs rather than the workers possess the skills. In D, the phrase beginning regardless ... is awkward and wordy in addition to being illogical.

看了这题答案的好几个选项，都不大明白。正确答案A中，requires of是什么用法？pay be ...的用法也好奇怪。大侠们能帮我解释一下么？谢谢！非常感谢！