Question

4.       ，it was accepted by most of the people present at the meeting (as)

尽管他的建议听起来很荒谬，但它还是被会上的大多数人接受了。

Answer 1

4. Absurd as his suggestion/advice sounded as弓1 导的让步状语从句要用倒装形式。

sound是系动词，不可用被动语态。