关于since 用延续性动词He must have taken the book since it isn't here.he has put on weight since he gave up smoking since 主句不是只能跟延续性动词吗 这两句中为什么是短暂性动词

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关于since 用延续性动词
He must have taken the book since it isn't here.he has put on weight since he gave up smoking since 主句不是只能跟延续性动词吗 这两句中为什么是短暂性动词