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 本题需弄清以break为中心的四个动词短语的意思。A项的break off意为“停止讲话”;B项的 breakdown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项的break out意为“突然发生”;D项的break through意为“有重要创建,突破”。
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