Question

— He ought to have been warned of the danger.
— ______, but he just wouldn’t listen to me.

A．So ought he

B．So he was

C．So was he

D．So he had

Answer 1

 B

ought to have been warned of表示“本应该被告诫有危险”，是对过去动作的推测，因此回答也应该用过去时。A的构成形式不对。而So he was必须与第一句谓语动词have been一致。