—I don't know why Denise started crying when I mentioned the wedding.

—It ______ what you said about her brother. Or, perhaps she is just nervous. [ ]

A. should have been  

B. couldn't have been

C. could have been

D. must have been

咦腺疾病中最常见的是

A．胰腺囊肿

B．胰岛素瘤

C．咦腺癌

D．胰腺囊腺瘤

E．急性胰腺炎