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来源：网络资源 2022-03-13 21:27:05
谓语部分构成
was/ were+doing
句式
肯定句：I was watching TV at that time.
否定句：I was not (wasn’t) watching TV at that time.
一般疑问句： Were you watching TV at that time?
特殊疑问句： What were you doing at that time?
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