Only in 1996 the determination and patience of the scientists with a breakthrough at last

发布时间：2020-08-16 13:26:39


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

网友回答

A. were ; paid off
B. did; pay back
(答案→)C. did ; pay off
D. did ; pay for
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