Dr Frank failed many times but he finally ________ to find a successful way to solve the problem. [ ]A. broke offB. broke throughC. broke downD. broke up-高中英语-魔方格

◎ 题干

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

[ ]

A. broke off
B. broke through
C. broke down
D. broke up

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◎ 解析

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◎ 知识点

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