改被动语态He was doing his homework at this time yesterday .
He was doing his homework at this time yesterday .
--His homework was being done by him at this time yesterday
...为什么不能改成
His homework was done by him at this time yesterday
人气：254 ℃ 时间：2019-08-19 12:37:59
解答
过去完成时的被动语态就是
was/were + being + done 记住就行了
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