The boys, this frightening person, lost their tongues. A. faceB. having facedC. facingD.

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A. face
B. having faced
(答案→)C. facing
D. faced
解析：考查非谓语动词作状语。状语The boys和face之间是主谓关系，所以用facing 作状语；having faced表示face这一动作发生在主句谓语动词lost之前，根据句子，这两个动作同时发生。所以选C。