It remains unknown the peace talk between the two countries is going to lead.A. whyB. when

问题补充：

It remains unknown the peace talk between the two countries is going to lead.

A. why

B. when

C. how

D. where

答案：

A. why

B. when

C. how

(答案→)D. where

解析：考查it作形式主语，真正主语为从句。在哪里这两个国家举行和平谈判还不为人们所知。