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 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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