His failure in the exam suggested that he __________ the teacher’s instructions.

A．can’t have followed

B．needn’t have followed

C．mustn’t have followed

D．shouldn’t have followed

治疗紫癜血热伤络证，应首选

A．茜根散
B．归脾汤
C．泻心汤
D．龙胆泻肝汤
E．犀角地黄汤