单选题 I only know the man by_____ but I have never spoken to him.无

【正确答案】 C

【答案解析】句意：只是跟那人见过面，但从没说过话。 know sb. by sight和某人面熟。 by chance偶然。 by heart记牢，熟记。 by experience凭经验；通过经验。