The old lady has developed a __________ cough which cannot be cured completel...

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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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