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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A类竞赛（研究生）

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