大全101,新问题,necessary的用法

aimee1019

101.    Although the Supreme Court ruled as long ago as 1880 that Blacks could not be excluded outright from jury service, nearly a century of case-by-case adjudication （has been necessary to develop and enforce the principle that all juries must be） drawn from “a fair cross section of the community.”
(A) has been necessary to develop and enforce the principle that all juries must be
(B) was necessary for developing and enforcing the principle of all juries being
(C) was to be necessary in developing and enforcing the principle of all juries to be
(D) is necessary to develop and enforce the principle that all juries must be
(E) will be necessary for developing and enforcing the principle of all juries being

答案为A
看过了之前讨论的帖子，我也觉得这题用has been更好，但是查了一下necessary的用法……就很疑惑……
longman
t is necessary (for somebody) to do something
It's not necessary to wear a tie.The doctor says it may be necessary for me to have an operation.
make it necessary (for somebody) to do something Falling profits made it necessary to restructure the business.
necessary for (doing) something
A good diet is necessary for maintaining a healthy body.

按照句意，是不是用necessary for更好呢……
sth has been necessary to do sth这个怎么看都觉得不对啊……

请NN指导……


make it nece

aimee1019

有没有人有想法呀……@.@还是我的思路完全偏了……可是真的非常想不明白呀……