Dr. Smith failed many times but he finally____to find a successful way to solve

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问题 Dr. Smith failed many times but he finally____to find a successful way to solve the problem.

选项 A、broke off
B、broke down
C、broke out
D、broke through

答案 D

解析各项的意思是：break off“停止讲话”；break down“(因机械、电力等故障)停止运转，失灵；失败，崩溃，瓦解；(身体状况)变得恶劣”；break out“突然发生”；break through“有重要创建，突破”。根据题意，D为正确答案。

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