问题补充：
-----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 he was
D. So he had
答案：
A. So ought he
(答案→)B. So he was
C. So he was
D. So he had
解析：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。
【标签】固定句型和情态动词
