Only in 1996 the determination and patience of the scientists with a breakthrough at last . A. were...
2023-01-04 19:58:39 115次 福建省福州市2009-2010学年度高二下学期期末联考试卷（英语） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Only in
1996 the determination and patience of the
scientists with a breakthrough at last .
A. were ; paid off
B. did; pay back C. did ; pay off D.
did ; pay for
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