Mary__________my letter;otherwise she would have replied before now.

A．has received

B．ought to have received

C．couldn’t have received

D．shouldn’t have received

由元参、麦冬、犀角、银花、黄连、生地、连翘、竹叶心、丹参组成的方剂是（）

A.犀角地黄汤

B.凉膈散

C.普济消毒饮

D.仙方活命饮

E.清营汤