He looks very tired . He ____ to bed too late last night .

A．must go

B．must have gone

C．could go

D．didn''t go

胎死不下气血虚弱证治疗首选方（）

A.脱花煎

B.桃红四物汤

C.生化汤

D.救母丹

E.保阴煎