—Look! A book is on the floor. Whose is it?

—It ______ be Rick’s. It has his name on it.

A．mustn’t

B．can’t

C．must

D．need

患者，男，40岁。既往有心肌梗死病史。近日心胸疼痛，如刺如绞，痛有定处，入夜为甚，甚则心痛彻背，背痛彻心，伴有胸闷，日久不愈，舌质紫暗，有瘀斑，苔薄，脉弦涩。治疗应首先考虑的方剂是（）。

A.柴胡疏肝散

B.血府逐瘀汤

C.栝蒌薤白半夏汤合涤痰汤

D.枳实薤白桂枝汤合当归四逆汤

E.生脉散合人参养荣汤