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Many satellites have been sent ________ into space.


  1. A.
    for
  2. B.
    out
  3. C.
    off
  4. D.
    up
D
send up是“发射”的意思。Send for表示“派……去请……”;send out表示“发出”“发送(信号)”;send off表示“寄发(信件)”“发送(信息)”。
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