Man-made-satellites into space by many countries.A. was sent upB. is sent upC. have been s

问题补充：

Man-made-satellites into space by many countries.

A. was sent up

B. is sent up

C. have been sent up

D. has been sent up

答案：

A. was sent up

B. is sent up

(答案→)C. have been sent up

D. has been sent up

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