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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