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

问题补充：

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

A. where

B. when

C. how

D. why

答案：

(答案→)A. where

B. when

C. how

D. why

解析：A 考察名词性从句。本句中的it是形式主语，真正的主语是空格以及后面的句子。从句主语谓语完整，由从句中的lead导致，通向，为不及物动词，后面缺少地点状语，使用where引导名词性从句。故A正确。