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Question 19: A. older antibiotics are being progressively replaced by broader-spectrum ones B. broader-spectrum antibiotics progressively re...

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Question 19:

A. older antibiotics are being progressively replaced by broader-spectrum ones

B. broader-spectrum antibiotics progressively replaced the older ones being used

C. the replacement of older antibiotics are increasingly broader-spectrum ones

D. broader-spectrum ones are older antibiotics being progressively replaced

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