The old man has developed a( )headache which cannot be cured in a short time.
考试：军队文职人员招聘
科目：英语言文学 (军队文职)（在线考试）
问题：
A：perpetual
B：permanent
C：chronic
D：sustained
答案：
解析：
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The old man has developed a( )headache which cannot be cured in a short time.
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