—Why not have a birthday party for our mother?—.A. Good ideaB. That's all rightC. You are

问题补充：

—Why not have a birthday party for our mother?

—.

A. Good idea

B. Thats all right

C. You are welcome

D. Never mind

答案：

(答案→)A. Good idea

B. Thats all right

C. You are welcome

D. Never mind

解析：考察交际用语。A好主意；B没有关系；C不用谢；D没有关系；结合句意可知A正确。句意：—为什么不为妈妈搞一个生日聚会呢？—好主意。