1.Where was it invented?
没有in.因为where是一个副词,是疑问副词,副词不与介词连用.疑问副词有：when,where,why,how.疑问副词在句中作状语.
2.Who was it invented by?
这里有by.因为who是一个代词,是疑问代词.疑问代词有who,whom,what,which.疑问代词在句中作主语、宾语或表语.
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Where was it invented [ in ] 如果不用,为什么Who was it invented 有个b
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