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    【题目】The president is committed to _______ the existing system of medical care.

    A.reformB.reformingC.have reformedD.having reformed

    【答案】B

    【解析】

    考查非谓语动词。句意：总统致力于改革现有的医疗保健系统。be committed to doing表示“致力于”，非谓语动词表示的动作与主句谓语表示的动作同时进行，没有明显的先后顺序，所以用动名词的一般式作宾语，故B项正确。

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