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 句意:那位老妇人得了慢性咳嗽,短时间内不能完全治愈。chronic(疾病)慢性的,延续很长时间或经常发生的。perpetual永久的,永恒的。permanent永久的,持久的。sustained持续的。不变的,不间断的。
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