2. 外语
  3. The old lady has developed a ______ cough which cannot be cured completely in a short time.

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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