问题补充：
I don’t think he could have done such a stupid thing last night, ?
A. did he
B. could he
C. do I
D. hasn’t he
答案：
(答案→)A. did he
B. could he
C. do I
D. hasn’t he
解析：选A.。 I think + 从句的反意疑问句根据宾语从句确定。could在此表示揣测，应变为he did such a stupid thing last night来考虑。
