锅炉事故的主要事故类型有水击事故、（）锅炉结渣等。

A.缺水事故

B.爆管事故

C.倒塌事故

D.汽水事

E.尾部烟道二次燃烧

You didn’t take his advice. ____ his advice, you _____ such a mistake.

A．Had you taken; wouldn’t have made

B．If you had taken; would make

C．Were you to take; shouldn’t have made

D．Have you taken; won’t have made