【单选题】
"The key to __________ the medical problems at the roots is health care reform", said the minister.
A. solve
B. solving
C. being solved
D. be solved
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根据网考网移动考试中心的统计,该试题:
15%的考友选择了A选项
61%的考友选择了B选项
16%的考友选择了C选项
8%的考友选择了D选项