2. 外语
  3. Dr. Smith failed many times but he finally ______ to find a successful way to solve the problem.

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

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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 A项break off意为“停止讲话”；B项break down意为“(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”；C项break out意为“突然发生”；D项break through意为“有重要创建，突破”。根据题意，D项为正确答案。
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