---Well done, Tom!
---Thanks. But given more time, I it better.
A. shouldn’t have done
B. could have done
C. might not do
D. could do
网友回答
A. shouldn’t have done
(答案→)B. could have done
C. might not do
D. could do
解析：考查情态动词及虚拟语气。shouldn’t have done本不应该做某事，而实际上做了，could have done 本可能做某事而实际上没有做，句意：汤姆，做的好！谢谢，但是如果给我更多时间的话，我本可以做的更好一些。故选B。