题目内容
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 |
D
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Dr. Frank failed many times but he finally _________ to find a successful way to solve the problem.
| A．broke through | B．put up | C．picked out | D．gave away |