问题
选择题
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
答案
答案：C
搜题请搜索小程序“爱下问搜题”
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
答案：C