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 近义词辨析。perpetual意为“持久的,永恒的”,指没有中断无限期的延续,常作定语,如:a treaty of perpetual friendship(永恒的友好条约);permanent意为“永久的,固定的”,强调不变性,如:permanent address(永久地址);chronic意为“慢性的,久病的”;sustained意为“相同的,持续的”。根据题意,慢性的(chronic)和疾病(气管炎)是固定搭配。
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