--Well done Jack!Thanks. But given more time I it better.A. shouldnt have doneB. cou

问题补充：

--Well done, Jack! --Thanks. But given more time, I it better.

A. shouldn have done

B. could have done

C. might not do

D. could do

答案：

A. shouldn have done

(答案→)B. could have done

C. might not do

D. could do

解析：本题为情态动词的考查。根据题干得知动作已经发生，情态动词+动词的完成式表示对过去的推测。