They are travelling__business.in,with,for,on 选哪个呢?啥意思?
人气：188 ℃ 时间：2020-04-15 04:35:35
解答
这里选择on
因为on business是个固定短语,表示在公务、在上班
翻译：他们因为公务而旅游!
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