—Oh doctor The wound on my leg is infected—You really shouldn’t have left it to the

问题补充：

—Oh, doctor, The wound on my leg is infected.

—You really shouldn’t have left it to the sun.

A. discovered

B. exposed

C. opened

D. buried

答案：

A. discovered

(答案→)B. exposed

C. opened

D. buried

解析：A发现B暴露，显露；C打开D埋葬；致力于；句义：—医生，我腿部的伤口感染了。—你本不应该把伤口暴露在阳光之下的。本句的动词expose与前面的it构成逻辑上的被动关系，故使用过去分词，根据句义说明B正确。