who designed this kind of machine?改为被动语态 help~

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whodesignedthiskindofmachine?改为被动语态help~whodesignedthiskindofmachine?改为被动语态help~whodesignedthiskindo

who designed this kind of machine?改为被动语态 help~
who designed this kind of machine?改为被动语态 help~

who designed this kind of machine?改为被动语态 help~
By whom was this kind of machine designed?

Whom was this kind of machine designed by? 我也是初学者啦。。。