She tried hard to keep calm in face of the students, but the sweat on her forehead _____ her ____.A.gave; awayB.tuned; downC.showed; outD.shut; off
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A解析句意：她努力地试图在学生面前保持镇定，但是她前额的汗水使她露了马脚。Give away: reveal露出了马脚；turn sb .down 拒绝；show sb.out带某人出去；shut sb.off使隔绝。