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英语翻译There is a crew of up to five workers.If the installatio

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英语翻译
There is a crew of up to five workers.If the installation takes three days ,and if the same two crew members work on the first and third days,then which one of the following could be the pair of crew members who work on those two days?
现有一队人,队伍里面最多5个工人.如果安装工作得花3天时间,而且相同的两个工作人员在第一天和第三天工作,那么以下中的哪俩人将会是在那两天工作的一对呢.