I tried my best to keep calm in face of the students, but the sweat on my forehead me .
A. gave; away
B. tuned; down
C. showed; out
D. shut; off
网友回答
A. gave; away
B. tuned; down
C. showed; out
D. shut; off
解析： 句意：我尽最大努力在学生面前保持镇定，但是我前额的汗水使她露了马脚。give away 露出了马脚；turn sb .down 拒绝；show sb.out带某人出。