—We expected you yesterday.

—I’m sorry，I ________ you to say that I couldn’t be here until today.

A．should have called

B．must have called

C．could call

D．would call

在选择实验室或其他检查时应注意()

A.检查的灵敏度和特异性

B.安全性

C.成本与效果分析

D.检查的时机

E.检查的意义