If you write something and send it immediately by email, which you _______ later regret, there is no

chance for second thoughts.  [ ]

A. would

B. should

C. have to

D. might  

吴先生，近日自觉下腹不适，便稀。今日做肠镜检查。检查结束后对肠镜进行灭菌处理。

应选用的化学消毒剂与浸泡时间正确的是 （）

A.1%增效戊二醛，30min

B.1%增效戊二醛，40min

C.2%戊二醛，30min

D.2%戊二醛，1h

E.2%戊二醛，10h