-The lights were left on all night long.    

-Yes. It seemed that John____.He was the last to leave.    [      ]

A. was to be blamed    

B. was to blame    

C. had been blamed  

D. should be blamed

我国目前实行的工程量清单计价，采用的单价是( )。

A．预算单价
B．实物单价
C．部分费用综合单价
D．全部费用综合单价