Man-made satellites ________ into space by many countries．


  1. A.
    was sent up
  2. B.
    is sent up
  3. C.
    have been sent up
  4. D.
    has been sent up
C
現(xiàn)在完成時(shí)的被動(dòng)語態(tài)。
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科目：初中英語 來源：英語教研室 題型：033

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