My most devoted friend Professor Yang often go hiking when he lived in the mountain tha

问题补充：

My most devoted friend, Professor Yang, often go hiking when he lived in the mountain that was covered with forest.

A. would

B. should

C. could

D. might

答案：

(答案→)A. would

B. should

C. could

D. might

解析：would表示过去习性惯动作。选A.