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

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

A.to

B.for

C.over

D.on

请帮忙给出正确答案和分析,谢谢!

热搜:宏病毒一般是指用basic书写的病毒程序寄存在