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When I came back home,my father was watching TV yesterday 为什么watch要加ing?

题目详情
When I came back home,my father was watching TV yesterday 为什么watch要加ing?
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答案和解析
当我回家时,我父亲正在看电视
was + watching ( 现在分词) 构成过去进行时,所以 watch 要加ing
不明白的再问哟,请及时采纳,多谢!