【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(yǔ)動(dòng)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(yǔ)動(dòng)詞表示的動(dòng)作與主句謂語(yǔ)表示的動(dòng)作同時(shí)進(jìn)行，沒(méi)有明顯的先后順序，所以用動(dòng)名詞的一般式作賓語(yǔ)，故B項(xiàng)正確。

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