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China has long been a leader in the field of genetic research at improving agric

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China has long been a leader in the field of genetic research at improving agric

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

[]A．

aimed

B．

aiming

C．

being aimed

D．

to aim

试题答案

答案：A

标签：theinoffieldleader

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