题目内容
() 8. Yuan Longping has spent all his life the research and the of the rice plants.
A. to;developed B. on;development
C. in;developing D. on;to develop
8.B8.B
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题目内容
() 8. Yuan Longping has spent all his life the research and the of the rice plants.
A. to;developed B. on;development
C. in;developing D. on;to develop