单选题 She had heard strange footsteps in the house several times, so she hired a private detective ______ to the matter.
A. go into B. put into C. look into D. take into

【正确答案】 C
【答案解析】[解析] 短语辨析题。有几次她听到屋子里有奇怪的脚步声，因此就雇了一个私家侦探来调查这件事情。四个短语里面只有look into有“调查研究”的意思。