28. 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 |
相关知识点
推荐套卷
28. 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 |