A
这里考查的是你对前文 could have been avoided（过去）本可以避免的（可事实上没能做到）
只要知道这种动词形式指的是过去, 就不难选出A 选项了
这样的错误本来是可以避免的. 但不幸的是, 他却一而再,再而三地犯这种错误（指过去犯错）
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such a mistake could have been avoided.unfortunately he—— th
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