2. 外语
  3. The basic problem, however, is that there is no central control ______ the health system.

The basic problem, however, is that there is no central control ______ the health system.

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问题 The basic problem, however, is that there is no central control ______ the health system.
选项 A、to
B、for
C、over
D、on
答案C
解析 control要求接over，意为"管理，控制"。
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