The old lady has developed a ______ cough which cannot be cured completely in as hort time.

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问题 The old lady has developed a ______ cough which cannot be cured completely in as hort time.

选项 A、perpetual
B、permanent
C、chronic
D、sustained

答案C

解析 chronic“慢性的”,常用来形容持续时间长的病症。perpetual永久的,主要指时间。permanent永久的,持久的,强调事物固定不变。sustained持续不变的,强调不间断性。
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