Gone are the days we spent together in the mountainous village.
A. when
B. that
C. where
D. on which
网友回答
A. when
(答案→)B. that
C. where
D. on which
解析：B 考察定语从句。定语从句中 we spent together in the mountainous village代词spend缺少宾语，使用关系代词that，指代先行词作为动词spend的宾语。故B正确。