2. 专升本
  3. "The key to______the medical problems at the root is health care reform," said the minister.

"The key to______the medical problems at the root is health care reform," said the minister.

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问题 "The key to______the medical problems at the root is health care reform," said the minister.
选项 A、solve
B、solving
C、being solved
D、be solved
答案B
解析 the key to doing sth．意为“做……的关键”，其中to为介词，其后一般接名词或动名词，所以排除选项A、D。因the key与solve为逻辑上的主谓关系，所以应用动名词的主动语态。故选B。
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