It’s going to be some time _____ he sees his father again, _____ business has just been started in Switzerland．A.after; whoB.before; whoseC.when; whoseD.since; who
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B解析考查before的用法及定语从句。句意：再过一段时间他才能再次看见他的父亲。他父亲的商业刚在Switzerland开办。Before在这里是才的意思， whose在这做定语。故选B。