they built the old house over one hundred years ago改为被动语态
问题描述：
they built the old house over one hundred years ago改为被动语态
答
the old house was built by them over hundred years ago
they 是主体,house客体,变被动 客体变主体,主体变客体,一般过去式 用 was,were + done ,house 单数,用was