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Recentlymedicalcarereformhasbecomethemostimportantpublichealthoverthecountry.A)focusB)problemC)matterD)issue请说明原因,

题目详情
Recently medical care reform has become the most important public health _____ over the country.
A) focus B) problem C) matter D) issue
请说明原因,
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答案和解析
issue
指正式问题的时候一般都用issue