That raised the costs of Medicare, represented 15% of the federal funds last year.A. it B. whatC. wh

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【题目】That raised the costs of Medicare, ______ represented 15% of the federal funds last year.

A. it B. what

C. which D. that

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【答案】C

【解析】句意：这增加了医疗保险的成本，这代表去年联邦基金的15%。此句构造了了非限制性定语从句，用which指代前面的句子，在定语从句中作主语。故选C。