The police asked him to what he had seen.A. set aboutB. set downC. set upD. set out

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A. set about
(答案→)B. set down
C. set up
D. set out
解析：词义辨析题。警察让他写下他所见到的事情。A. set about 开始       B. set down 写下      C. set up 设立       D. set out 开始 根据语境选B