— I've told Nancy many times about the meeting, but she still forgot it!

— I understand. Actually, anyone _____ be very forgetful at times. [ ]

A. must

B. should

C. ought to

D. can

设备工程市场的客体是( )，

A．设备工程的业主

B．设备工程的承包人

C．设备监理工程师

D．设备工程建设项目