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题目内容
（川北医学院英语2）
Dr. Frank failed many times but he finally _______ to find a successful way to solve the problem.(本题4.0分)
A、 broke off
B、 broke up
C、 broke down
D、 broke through
A、 broke off
B、 broke up
C、 broke down
D、 broke through
参考答案