This idea must be,____ it appears to me ,cast away.A,as B,for C though D,but 请帮我分析一下

This idea must be,____ it appears to me ,cast away.A,as B,for C though D,but 请帮我分析一下
This idea must be,____ it appears to me ,cast away.
A,as B,for C though D,but 请帮我分析一下

This idea must be,____ it appears to me ,cast away.A,as B,for C though D,but 请帮我分析一下
This idea must be,_as___ it appears to me ,cast away.
应该选A.这句话的主干是this idea must be cast away.中间插入了as引导的非限制性定语从句as it appears to me.
意思是：正如我看来,这个想法必须被抛弃.