英语,关于插入语的问题_____from what he said,the scientist must have ex

英语,关于插入语的问题
_____from what he said,the scientist must have experienced a lot of difficulties in his invention.
A.Judged B.Being judged C.Judging
D.Having judged
先说说我的想法,我做这道题的思路是,如果the scientist是 judge的执行者,就选主动形式的C或者D.如果 the scientist是 judge的承受者,就选被动形式的A.但这两种情况都不是,所以这应该是插入语.
我的问题是：插入语中的动词都是ing形式的吗?
比如generally speaking
断定是插入语后,我能不能直接选C这种形式的选项呢?