“The key to_______the medical problems is health care reform,”said the minister.

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问题 “The key to_______the medical problems is health care reform,”said the minister.

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

答案B

解析 考查固定用法及动词语态。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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