—I wonder why Mr. Green looks quiet in class.
—I'm not sure, but he（）a small accident driving here.

A. could have

B. might have

C. might have had

D. must have had

管理药品和管理药学企事业组织的组织是（）

A.药品生产、经营组织

B.事业性药房组织

C.环境保护组织

D.药学管理的行政组织

E.药事社会团体