问题
选择题
China succeeded ______ sending up its first man-made satellite (卫星) ______1970. [ ]
A. on, in
B. on, on
C. in, in
D. at, in
答案
答案：C
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China succeeded ______ sending up its first man-made satellite (卫星) ______1970. [ ]
A. on, in
B. on, on
C. in, in
D. at, in
答案：C