In his speech, he said that it was his primary school teachers that he was fond of influen

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A. what
B. which
(答案→)C. who
D. as
解析：考查强调句。分析句子结构可知，句中采用的是强调句式，其中被强调的部分是“his primary school teachers that he was fond of”，指人，故选who。句意：在演讲中，他说是他喜欢的小学老师影响了他的一生。故C正确。