Who invented it? 改成被动语态~
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Whoinventedit?改成被动语态~Whoinventedit?改成被动语态~Whoinventedit?改成被动语态~whowasitinvented?
Who invented it? 改成被动语态~
Who invented it? 改成被动语态~
Who invented it? 改成被动语态~
who was it invented?