题目内容
Dr.Frank failed many times but he finally _______ to find a successful way to solve the problem.
| A.broke off | B.broke up | C.broke down | D.broke through |
D
解析
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题目内容
Dr.Frank failed many times but he finally _______ to find a successful way to solve the problem.
| A.broke off | B.broke up | C.broke down | D.broke through |
D
解析