---he ought to hav been warned of the danger.---___ , but he wouldn't listen to me .a. so ought he b. so he was c. so was he d. so he had 为什么选A，谢谢，详细！
热心网友
so+助动词+代词ought to =shold 是情态动词 ABCD都是倒装句。
热心网友
---He ought to hav been warned of the danger.---___ , but he wouldn't listen to me .a. so ought he b. so he was c. so was he d. so he had 为什么选A，谢谢，详细！ 答："ought"是助动词，是在部分倒装啊！
热心网友
ought to 是情态动词，相当于should，因此选A
热心网友
因为BCD一看就不对嘛