大家好，想請問下面這道題目：
That the psychopharmacological journal had already published the findings of
the clinician`s experiment rendered _____ any prior misgivings she had
regarding the validity of her control group.
A)extant
B)moot
C)fallacious
D)topical
E)retroactive
答案是B: 無用的。
想問的是這句話文法上面要怎麼解釋呢？
想確定 That the psychopharmacological journal had already published the findings of
the clinician`s experiment 是名詞子句作為主詞？
還有個問題是他人解答說這是倒裝句，我不知道要怎麼倒裝。
是把 S. + V. + O. + OC 改成S. + V. + OC. + O.嗎？
一般而言有這樣的改法嗎？因為查倒裝句都只查到主詞和動詞改順序。
謝謝。