- The water was left running all night long.

- Yes. It seemed that John ___. He was the last one to leave the lab.

A．was to be blamed

B．was to blame

C． had been blamed

D． should be blamed

建设工程从表面上检查很难发现内在的质量问题，这体现了工程质量的( )。

A．波动大

B．评价方法的特殊性

C．隐蔽性

D．终检局限性