He suddenly appeared on ____ rainy night, which was ____ great surprise to us.

A．a; /

B．the; a

C．a; a

D．the; the

苯妥英钠与何药合用时，疗效增强

A．苯巴比妥

B．乙醇

C．皮质类固醇

D．避孕药

E．氯霉素