I walked up to the top of the hill with my friends we enjoyed a lovely view of the lake

问题补充：

I walked up to the top of the hill with my friends, we enjoyed a lovely view of the lake.

A. which

B. where

C. who

D. that

答案：

A. which

B. where

C. who

D. that

解析：句意：我和朋友们一起走上了山顶，在那里我们欣赏了可爱的湖景。先行词是top，在此处指地点，关系词在从句中作地点状语，故用关系副词where，