【求助】gwd-26-40

Q40

The computer company’s present troubles are a result of techno-

logical stagnation, marketing missteps, and managerial blunders

so that several attempts to revise corporate strategies have failed

to correct it.

A.     so that several attempts to revise corporate strategies have

failed to correct it.

B.     so that several attempts at revising corporate strategies have

failed to correct

C.    in that several attempts at revising corporate strategies have

failed to correct them

D.    that several attempts to revise corporate strategies have

failed to correct

E.     that several attempts at revising corporate strategies have

failed to correct them

答案是d，可我觉得是b，求教

这个题用attempt to do这点来做比较快，优于attempt doing，是个优选结构，

例如OG227题：

227. Judicial rules in many states require that the identi­ties of all prosecution witnesses are made known to defendants so they can attempt to rebut the testi­mony, but the Constitution explicitly requires only that the defendant have the opportunity to confront an accuser in court.

(A)  that the identities of all prosecution witnesses are made known to defendants so they can attempt to rebut

(B)  that the identities of all prosecution witnesses be made known to defendants so that they can attempt to rebut

(C)  that the defendants should know the identities of all prosecution witnesses so they can attempt a rebuttal of

(D)  the identities of all prosecution witnesses should
                be made known to defendants so they can
                attempt rebutting

（E）aking known to defendants the identities of
                all prosecution witnesses so that they can
                attempt to rebut

OG解释：The phrase attempt to rebut is more idiomatic than the phrases that replace it in C and D

请问选择D的兄弟，THAT在这里面指代的先行词是什么呢？而且选择D是不是放弃了原句的so that 结构呢？

3X!

open to discuss

先行词是a result?