问题
选择题
Several man-made satellites _______ in Xichang in the past five years. [ ]
A. have sent
B. have sent up
C. has been sent up
D. have been sent up
答案
答案：D
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Several man-made satellites _______ in Xichang in the past five years. [ ]
A. have sent
B. have sent up
C. has been sent up
D. have been sent up
答案：D
