If people from different countries learn to respect each other’s customs and cultures, our world will sure to bee a big happy family .
A. some time B. some day C. some times D, sometimes
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解析:考查近义词辨析。句意“如果不同国家的人学会相互尊重各自的风俗和文化,总有一天,我们的世界一定会变成一个欢乐的大家庭。”A“一段时间”;B“(过去或将来的)某一天”;C“几次”;D“有时”。故选B。