问题
选择题
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
答案
答案：C
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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
答案：C