Jamie is a cook ideas are changing school dinners.A. whoB. whomC. whoseD. that

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A. who
B. whom
(答案→)C. whose
D. that
解析：考查定语从句。杰米是一个有着改变校餐想法的厨师。本句中先行词cook和从句主语ideas是逻辑上的所有关系，故引导词用whose，故选C。