自然铜煅制的目的是（）

A.使药物酥脆、便于粉碎和煎出

B.使药物质地纯洁细腻，适宜于眼科及外敷用

C.产生止血的作用

D.增强收涩敛疮、止血化腐的作用

E.增强固涩收敛、明目的作用

— How I wish I had worked harder before the examinations.

— If you had, you _____them already.[ ]

A. would pass        

B. would have passed

C. were to pass        

D. will have passed