— Why didn’t you come to Mike’s birthday party yesterday?

　　— Well, I ____, but I forgot it.

A．should

B．must

C．should have

D．must have

锅炉房的辅助间（水泵间、水处理间、修理间、化验室、生活室和办公室）宜布置在不同建筑物内，辅助间设于锅炉房固定端，另一端作扩建用。