The old lady has developed a______cough which cannot be cured completely in a short time.

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问题 The old lady has developed a______cough which cannot be cured completely in a short time.

选项 A、perpetual
B、permanent
C、chronic
D、sustained

答案C

解析 考查形容词辨析。perpetual“永远的,永恒的”;permanent“永久的,持久的”;chronic“长期的,慢性的”;sustained“持续的”。句意为“这个老妇人患了慢性咳嗽,短期不可能痊愈”。chronic disease专指“慢性病”,故选C。
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