China has long been a leader in the field of genetic research improving agriculture.A. a

发布时间：2020-08-16 08:48:30

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

网友回答

A. aim to
B. aiming on
(答案→)C. aimed at
D. aims with
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