题目内容
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
B. were carried into
C. have been sent into
D. have been brought into
C
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D.You know which of these |
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B.go through; approved |
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