[請益] 句子解析

[perist ()]

He added that many things would have been possible had the offer been accepted.

動詞有兩個，也不是省略that的子句
如何解讀?


出處是 VOA
http://learningenglish.voanews.com/content/north-korea-offers-us-officials-nuclear-talks-with-conditions/2598701.html

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→ perist: 問題已解 是條件子句
→ perist: had the offer been accepted = if the offer had been
→ perist: accepted