问题
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
B:aiming on
C:aimed at
D:aims with
正确答案是：
同类题型
I am going back to America for Thanksgiving Day.—_________. And we will miss you.
All flights ____ because of the snowstorm, many passengers could do nothing but take the train
He is talking so much about America as if he _____ there
Can you me a job when I get there? You know, I have to work in order to pay for my schooling. [ ]