【题目】The little boy stared at the strange man questioningly, not whether to believe what he had said.
A. to knowB. knowing
C. knownD. having known
在线课程【答案】B
【解析】
考查非谓语动词。句意：小男孩疑惑地盯着这个陌生人，不知道自己是否该相信他说的话。little boy与know之间是逻辑上的主谓关系，表示主动，用现在分词作伴随状语，故B项正确。