— I had to take a taxi home yesterday because my car broke down.

— You ____. I was not using it.[ ]

A. could have borrowed mine.

B. couldn't have borrowed mine.

C. must have borrowed mine

D. shouldn't have borrowed mine

钙拮抗药对心肌的作用包括

A．负性肌力作用

B．降低窦房结的自律性

C．减慢房室结的传导速度

D．延长房室结的有效不应期

E．对缺血心肌有保护作用