常发生于尿路器械检查后的细菌是（）
A.变形杆菌
B.克雷白杆菌
C.产气杆菌
D.铜绿假单胞菌
E.葡萄球菌
参考答案：D
I am sorry. I______finished it by last Monday, but I have been too busy.
A．must have
B．may have
C．ought to have
D．might have
