22. Dr. Frank failed many times but he finallyto find a successful way to solve the proble

发布时间：2020-08-15 02:36:56


22. 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

网友回答

A. broke off
B. broke up
C. broke down
(答案→)D. broke through
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