—What's the time?

—______.[ ]

A. It's thirty to eight    

B. It's at seven thirty

C. It's seven past thirty  

D. It's half past seven

发生重大医疗过失行为，导致患者死亡的事故，医疗机构在多少小时内报告（）

A.3h

B.6h

C.12h

D.24h

E.48h