Had they known what was coming next, they________ second thoughts. [ ]

A. may have

B. could have

C. must have had  

D. might have had

具有泻下攻积，润燥软坚，清热消肿功效的药物是（）

A.大黄

B.甘遂

C.芒硝

D.番泻叶

E.郁李仁