Thanks to advances in science and technology, many people that might at one time have been crippled as children by diseases such as poliomyelitis or Charcot-Marie-Tooth disease now enjoy near-normal lifestyles.
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Athat might at one time have been crippled as children
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Bwho might once have been crippled in childhood
分析该选项
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Cthat as children might once have been crippled
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Dwho in childhood might have at one time been crippled
分析该选项
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Ewho, when they were children, might at one time have been crippled
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正确答案: B