My best friend, Li Ming, ________ was a singer now, moved to America with his parents after his graduation, ________ he was very successful．A.that; thatB.who; whichC.which; whereD.who; where
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D解析关系词在第一个空中作主语，指代前面的先行词Li Ming，因此，排除了that(不能引导非限制性定语从句)和which(指代前面的物)；第二个空的先行词是America，在后面从句中作地点状语，应该填where，故选D项。