He tried hard to keep calm in face of the policemen, but the sweat on his forehead _________.A.turned him downB.gave him awayC.showed him outD.shut him off
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B解析 本题考查动词短语辨析。句意：面对警察，他努力保持冷静，但他额头上的汗让他露出了马脚。give away出卖。turn down拒绝；show out送出（客人）shut off关掉，与shut down意思相近。