given有兩種用法與此句相關。1.後接名詞詞組，表示原因或條件。
柯林斯：
A. used when indicating a possible situation in which someone has the opportunity or ability to do something. 表示條件
eg. Given patience, successful breeding of this species can be achieved.
B. If you say given something, you mean taking that thing into account. 表示原因
Given the uncertainty over Leigh's future I was left with little other choice.
2. 後接that從句，that可省略，表示原因
If you say given that something is the case, you mean taking that fact into account. 表示原因
eg. Usually, I am sensible with money, as I have to be, given that I don't earn that much.
作為介詞用法的given, 牛津、朗文、劍橋詞典不管其後跟什麽結構，壹律解釋為原因：taking (sth) into account
由此可見，given表示條件的意義非常有限，即使有，也傾向於後接名詞詞組而不是分句。
suppose (that), supposing (that), provided (that), providing (that)都可以用作條件狀語分句引導詞（但沒有supposed)； considering其實與given功能相同（見柯林斯詞典），都表示原因，所以也不合適。本句需要的是條件概念的分句。“主將從現”結構明顯，只能是條件或時間句。