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英语翻译I guess they ______ ______ ______ their work.

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英语翻译
I guess they ______ ______ ______ their work.
英语翻译I guess they ______ ______ ______ their work.
填 must have finished

must have completed
再问: 请讲解一下好吗?
再答: 根据句意: 肯定的猜测用must , 现在完成时强调对现在的结果‘ 完成了’ ,所以答案是 must have finished/ completed