问题
选择题
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
答案
答案：D
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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
答案：D
