问题标题：
---Suchamistakecouldhavebeenavoided．---Unfortunately，hethemistakeagainandagain．（）A.repeatedB.wouldrepeatC.hadrepeatedD.wouldhaverepeated
问题描述：
---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
李本会回答：
答案：A 句中“could have been avoided”表示过去本来可以避免（而实际上并没有避免的事情），所以答语也应该是指他在过去一再犯错误，所以用一般过去时，即repeated．故选A
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