He sang just now.(用when I came here 改写句子） He _______ ________ when I came here
He cleaned the blackboard yesterday.(用at this time yesterday代替yesterday)
He ______ _______ the blackboard at this time yesterday
人气：463 ℃ 时间：2020-03-28 22:05:01
解答
应该填写
was singing
was cleaning
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