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their work (finished),they went home singing and laughing.

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their work (finished),they went home singing and laughing.
括号里为什么不填having finished
( having been informed )of the changes,I wasn‘t surprised at all
为什么括号里又不填 informed呢
第一个:该问题只强调发生了,即过去的一个事实,表达工作完成的状态
第二个:该问题则强调对过去的影响,即被提醒,所以不惊讶所以用完成时表影响