问题
选择题
Scientists think they have ____ in their attempt to find the causes of some major disease. [ ]
A. broken through
B. worked through
C. got through
D. gone through
答案
答案：A
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Scientists think they have ____ in their attempt to find the causes of some major disease. [ ]
A. broken through
B. worked through
C. got through
D. gone through
答案：A