下列不属于公共建筑的是（）
A.旅馆
B.办公楼
C.商场
D.学生宿舍
参考答案：D
--I can’t solve the math problem because it is too difficult. What should I do?
-- _________ ask the teacher for help?
A．How about
B．What about
C．Why don’t you
D．Why not you
