问题补充：
― Why you stay in the countryside, where it’s not convenient to go shopping?
―But I’ve found it rather valuable for my health.
A. can
B. must
C. may
D. shall
答案：
A. can
(答案→)B. must
C. may
D. shall
解析：情态动词辨析题。A. can能 B. must 偏要 C. may 可以 D. shall 将会句意：为什么你偏要呆在乡村在那购物不便？但是我发现在那对我健康有好处。根据语境选B
