— Who do you think ______ the book here?

— It may be John. He was sitting here all the morning.

A．was leaving

B．leaves

C．had left

D．has left

在我国行政领导者的四种方式中,委任制的主要弊端是( )

A．视野狭窄

B．行政迟缓

C．权力分散

D．不适宜专业行政领导的产生