摘要： At last the determination and patience of the scientists in 1996 with a breakthrough - the cloning of Dolly the sheep. A. paid off B. objected to C. called up D. took away
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At last the determination and patience of the scientists _______in 1996 with a breakthrough -------- the cloning of Dolly the sheep.
A. paid off B. paid out C. paid back D. paid up
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At last the determination and patience of the scientists _______in 1996 with a breakthrough -------- the cloning of Dolly the sheep.
A. paid off B. paid out C. paid back D. paid up
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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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