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    【题目】Charles Dickens once said, “Never close your lips to those _______ you have already opened your heart.”

    A. who B. that C. whom D. whose

    【答案】C

    【解析】

    试题分析：句意：查尔斯·狄更斯曾说：“永远不要对打开你心扉的人沉默不语。”分析句子结构可知，该空和前面的介词to一起引导定语从句，且在后面定语从句中作宾语，指人，故选C项whom。A项who不与介词连用。

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