目前大、中型厂房广泛采用的屋盖形式是（）。
A.坡屋顶
B.平瓦屋面
C.无檩结构屋顶
D.压型钢板屋面
参考答案：B
— There was a lot of fun at yesterday's party. You ________ come. Why didn't you?
— What a pity! But I had no time because I had lots of homework to do. [ ]
A. must have
B. should
C. need have
D. ought to have
遇到衣冠不整欠缺礼貌的客人到餐厅用膳时怎么办？
