A. | have been | B. | has | C. | had been | D. | have |
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A. | in which | B. | about which | C. | by which | D. | for which |
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A. | that | B. | whoever | C. | anyone | D. | who |
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A.Using expensive testing equipment B.Staffing a modern hospital C.Testing becoming a great help D.Cost of medical accidents E.Cost of training medical workers F.Measures of reducing medical costs |
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