No matter how frequently ______, the works of Beethoven always attract large audience.

A．performing

B．performed

C．to be performed

D．being performed

治疗急性胰腺炎肠胃热结证，应首选（）。

A.小柴胡汤

B.小承气汤

C.大承气汤

D.清胰汤合龙胆泻肝汤

E.茵陈蒿汤