— have some water? – Good idea.A. Why don’t B. Why not C. What about

问题补充：

— have some water? – Good idea.

A. Why don’t B. Why not C. What about

答案：

解析：句意：——为什么不喝些水呢？——好主意。Why don’t you do sth?=Why not do sth.?“为什么不做某事呢？”What about +doing sth？“做某事怎么样？” 根据空格后接的是动词原形have，故选B。