By around 900 AD,there were many places in Northern Europe the Vikings chose to live.
A. in which
B. when
C. which
D. at which
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(答案→)A. in which
B. when
C. which
D. at which
解析：本题考查短语从句。句中先行词为many places，在定语从句中作live in的宾语，故用关系词which。句意：到大约公元前900年，维京人选择生活在北欧的许多地方。