摘要： China has long been a leader in the field of genetic research aimed at improving agriculture. 在以提高农业生产为目标的基因研究领域里.中国长期以来都处于领先地位. Unit 12 Fact and fantasy
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China has long been a leader in the field of genetic research ________ improving agriculture.
A. aim to B. aiming on C. aimed at D. aims with
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