"The key to__________the medical problem

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问题 "The key to__________the medical problems is health care reform," said the minister.A.solveB.solvingC.being solvedD.be solved

选项 A.solve
B.solving
C.being solved
D.be solved

答案 B

解析考查同定用法及动词语态。the key to doing sth．表示“做某事的关键”，句中to是介词，后面加动词的ing形式。句意为“部长说：‘解决医疗问题的关键是医疗改革”’。句子表达的“解决医疗问题”，是主动意义，故选B。

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