The three backpackers finally reached the top of Mount Huangshan, they could enjoy the breathtaking sights to their heart's content.
A. when
B. where
C. why
D. how
网友回答
A. when
(答案→)B. where
C. why
D. how
解析：B考察定语从句。先行词是Mount Huangshan，后面定语从句很完整，故使用where引导定语从句，在句中做地点状语。