Though the average urban commuter could travel on public rail systems more efficiently and at lesser cost than they can in private automobiles, many residents even of crowded cities prefer the feeling of autonomy inherent in driving one's own car.
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Alesser cost than they can
分析该选项
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Bfewer costs than they can
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Cfewer costs than he or she can
分析该选项
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Dlower cost than he or she can
分析该选项
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Elower cost than they can
分析该选项
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正确答案: D