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

A.reformB.reformingC.have reformedD.having reformed

【答案】B

【解析】

考查非謂語動詞。句意：總統(tǒng)致力于改革現(xiàn)有的醫(yī)療保健系統(tǒng)。be committed to doing表示“致力于”，非謂語動詞表示的動作與主句謂語表示的動作同時進行，沒有明顯的先后順序，所以用動名詞的一般式作賓語，故B項正確。

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