Looking back their senior school life, many university students said they____have wasterd so much time on computer games then.

A．couldn’t

B．wouldn’t

C．needn’t

D．shouldn’t

肝性脑病抽搐时，最好选用的药物是（）

A.地西泮

B.哌替啶

C.吗啡

D.氯丙嗪