In the last few years, we have made grea
题型：选择题
问题：
In the last few years, we have made great progress________telecommunication.[ ]
A. in area of
B. in field of
C. in the area of
D. on the field of
In the last few years, we have made great progress________telecommunication.[ ]
A. in area of
B. in field of
C. in the area of
D. on the field of