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Today， working less than a 40-hour week， people enjoy more leisure time. Hence， the wise use of leisure time has become an important problem for everyone， young or old. It is a particularly difficult problem for the sick， the aged， and those who have retired from earning a living. Those people have so much leisure that it is hard for them to find interesting and worthwhile ways to use it.

How to spend leisure time wisely is not a particularly difficult problem for people ______.

A.who are very busy everyday

B.who are sick in bed

C.who are aged and in good health

D.who have retired from work

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