They covered the body of the little hero with a flag, leaving his face.A. to exposeB. expo

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A. to expose
B. exposing
(答案→)C. exposed
D. expose
解析：考查非谓语动词。leave + 宾语 + 宾语补足语，主要分析宾语与补足语之间的关系，his face与expose是被动意义上的关系，所以用过去分词。过去分词exposed在句中相当于形容词。