摘要：31．Years of efforts when they saw the pictures of the moon sent back to the earth by Chang’e-1. A．paid off B．took off C．showed off D．went off
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Years of efforts ________ when they saw the pictures of the moon sent back to the earth by Changel．
- A.showed off
- B.took off
- C.paid off
- D.went off
Years of efforts when they saw the pictures of the moon sent back to the earth by Chang’e-1.
A. paid off B. took off C. showed off D. went off
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