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When he was in his fifties, Mr. Steiner lived in Austria,________ he was known as a musician.
A、what
B、where
C、which
D、that
【正确答案】：B
【题目解析】：该题考查非限制性定语从句的引导词。本句中非限制性定语从句的引导词指代前句中表示地点的短语in Austria，故选择B。