I tried my best to keep calm in face of the students but the sweat on my forehead me.A.

问题补充：

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

答案：

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。