问题补充：
---- going hiking tomorrow, Sandy?
-----Good idea.
A. What about
B. Why not
C. Why don’t you
D. Would you
答案：
(答案→)A. What about
B. Why not
C. Why don’t you
D. Would you
解析：考查提建议的句型。句意；----明天去徒步旅行怎么样，sandy？-----好主意。故选A。what about doing sth ,why not do sth .
