The policemen compared the suspect’s footprints with _____ f
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选D,those.因为 found at the crime scene 是过去分词作定语修饰those,因为这里并不是定语从句,因此不能用what 或which(如果非要用应该是 which was found at the crime scene.) 而footprints 是复数,因此排除that.

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