My mother watched TV 句型转换

是改写句子

My mother( )( )TV when I came back home.
这两空中应该填什么.
我觉得上句没有Be动词.所以下句也应该不会是"was watching"[观点错误吧?]
我用的是"did watching"
不过我似乎觉得错的更离谱了..
希望给予讲解.

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