关节的结构包括（　　）

A．关节面、关节囊、关节头

B．关节头、关节囊、关节腔

C．关节面、关节囊、关节腔

D．关节头、关节窝、关节腔

—What else did you do this morning besides doing the shopping?

—Two hours__________washing the windows and the floor.

A．were taken

B．was spent

C．has taken

D．will be spent