Do you know many man-made satellites _____ space by our scientists since the middle of the twentieth century?

A. have sent into
B. were carried into
C. have been sent into
D. have been brought into
C
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Do you know many man-made satellites _____ space by our scientists since the middle of the twentieth century?
[     ]
A. have sent into
B. were carried into
C. have been sent into
D. have been brought into

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