—Such a mistake could have been avoided.
—Unfortunately, he the mistake again and again.
A. repeated
B. would repeat
C. had repeated
D. would have repeated
网友回答
(答案→)A. repeated
B. would repeat
C. had repeated
D. would have repeated
解析：因为could have done是对过去发生的事表示遗憾，所以答语也应该是指他在过去一再犯这样的错误。