题目

—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 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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