請教verbal review上的一題

#58

A recording system was so secretly installed and operated in the Kennedy Oval Office that even Theodore C. Sorensen, the White House counsel, did not know it exited.

(A)
        A recording system was so secretly installed and operated in the Kennedy Oval   Office that

(B) So secret was a recording system installation and operation in the Kennedy Oval Office

(C) It was so secret that a recoeding system was installed and operate in the Kennedy Oval Office.

(D) A recording system that ws so secretly installed and operated in the Kennedy Oval Office

(E) Installed and operated so scretly in the Kennedy Oval Office was a recording system that

可否請大牛們解一下?

另外針對(e) 的選項.ETS的解釋為: The inverted word order does not grammatically fit into the rest of the sentence. 怎麼說呢? 我看不出(e) 哪裡does not fit?

the answer is A,

for E. E) Installed and operated so scretly in the Kennedy Oval Office was a recording system that

 the word "that" has no use here.

If we change the sentence to the following, it can be right:

Installed and operated so scretly in the Kennedy Oval Office was a recording system. Even Theodore C. Sorensen, the White House counsel, did not know it exited.