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The machine was invented by David.(对划线部分提问)     was the machine invented by?

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himself   he himself   he for himself   he by himself
  
invention; invented; inventors    inventor; invented; inventions    inventor; invented; invention    inventions; invented; inventors  
When was the machine invented?    Who the machine invented    Whom the machine was invented by    Who was the machine invented by?  
shy  rude  creative  friendly  
newly-inventing             newly-invented      newly-invent               newly-invention  
shy  rude  creative  friendly  
ever  already  even  nowadays  
than    as   that    what  
ever    thus    yet    as  
will be made use of    will make use of    will be made use    will be used of  
ever    already    even    nowadays  
Who was it invented by  When was it invented  What is it used for  Where was it bought  
was invented    being invented    invented    had been invented  
ever   already    even   nowadays  
invents    to invent    invented    was invented  

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