— Can you explain ____ you have been late for school several times this term?

— Sorry, but it is the first time that I have been late this week.

A．why it is that

B．how it is that

C．why is it that

D．how is it that

急诊处理急性尿潴留最常用的方法是（）。

A.耻骨上膀胱穿刺造瘘

B.急诊导尿

C.耻骨上膀胱穿刺抽尿

D.膀胱镜检查

E.快速输液