牙齿的主要功能是________、_________、_______食物，所以我们应保护好牙齿。
切断 撕裂 磨碎
I would have gone to visit him in the hospital had it been at all possible, but I_______ fully occupied the whole of last week.
A．were
B．had been
C．have been
D．was
委托勘察设计单位编制工程概预算的费用属于( )。
A．建设单位管理费 B．建设单位开办费C．勘察设计费 D．建设单位经费
