—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
A
由could have been avoided（本來(lái)可以避免）可知雙方在談?wù)撨^(guò)去的事。故選A
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