I suggested the person ----- to be put into prison

C
the person referred to=the person who was referred to【涉及的人】,夲句是过去分词作后置定语.
还有夲句省略了should.完整句子为
I suggested the person (referred to) should be put into prison.
suggest +从句 【从句的谓语为(should )+动词原形】
天天开心!
再问： 这里从句里的动词原型是哪个
再答： be be是动词原形。