It’s going to be some time _____ he sees his father again, _____ business has just been started in Switzerland．
A．a(chǎn)fter; whoB．before; whoseC．when; whoseD．since; who
B
考查before的用法及定語從句。句意：再過一段時間他才能再次看見他的父親。他父親的商業(yè)剛在Switzerland開辦。Before在這里是才的意思， whose在這做定語。故選B。
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