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Great changes     in our school in the past few years.(  ) A.have taken place B.took place C.take...

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will cause  caused  was causing  had caused  
whose  who  to whose  to whom  
has been    have been    was    were  
witnessed    accumulated    arisen    introduced  
took place  have taken place   were taken place  have been taken place,  
revise    reserve    reveal    resolve  
has been    have been    was    were  
whose  who  to whose  to whom  
proposed  demanded  made  witnessed  
witnessed    accumulated    arisen    introduced  
about    out    back    up  
have had   have been   were   has been  
have taken place    have had    have been    were  
has been    have been    was    were  
are    were    had    have been  
have been    has been    was    were  
apart from  but for  except  besides  
take place    have taken place    took place   are taken place  
has experienced    .experienced    experimented    has experimented  

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