问题

The old lady has developed a _______ cough which cannot be cured completely in a short time.

A

perpetual

B

permanent

C

chronic

D

sustained

答案解析

本题考查形容词辨析

C选项,句意为“这个老妇人患了慢性咳嗽,短期不可能痊愈”,chronic“长期的,慢性的”。chronic disease专指“慢性病”,综上,C选项正确。

A选项,perpetual“永远的,永恒的”,故排除。

B选项,permanent“永久的,持久的”,故排除。

D选项,sustained“持续的”,故排除。

故正确答案为C项。

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