20．You the light．It’s bright enough here．We can see everything clearly．A．mustn’t turn off B．must turn on C．needn’t turn on D．may turn on 【查看更多】

 

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You ________the light．It’s bright enough here．We can see everything clearly．


  1. A.
    mustn’t turn off
  2. B.
    must turn on
  3. C.
    needn’t turn on
  4. D.
    may turn on

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