As a result of medical advances, many people that might at one time have died as children of such infections as diphtheria, pneumonia, or rheumatic fever now live well into old age.
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Athat might at one time have died as children
分析该选项
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Bwho might once have died in childhood
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Cthat as children might once have died
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Dwho in childhood might have at one time died
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Ewho, when they were children, might at one time have died
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正确答案: B