He became inspired when he thought about helping ordinary people to cholera.
A. expose
B. exposing
C. to expose
D. exposed
网友回答
A. expose
B. exposing
C. to expose
(答案→)D. exposed
解析：考查过去分词做定语：句意：当想到要帮助那些得了霍乱的普通人，他就受到了鼓舞。Be exposed to遭受，暴露于易受感染的环境 ，用过去分词作定语修饰people，选D。