—Such a mistake could have been avoided. —Unfortunately, he the mistake again and again.A

—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

(答案→)A. repeated　　　　　　　　　　B. would repeatC. had repeated　　　　　　　　D. would have repeated解析：由could have been avoided（本来可以避免）可知双方在谈论过去的事。故选A

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