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阅读理解：
The problem of leisure is new.Until very recent times people worked each day to the limit of their strength.Of course there were always a privileged few who had leisure;but most men had to work 12,14,or even 16 hours a day,six days a week.As late as 1840 the average factory worker labored 72 hours a week."Sunup to sundown"was the farmer's day,or as another phrase puts it,"from can to can't."
The phrase"from can to can't"means ______.
A.from beginning to end
B.from birth to death
C.from morning to night
D.from time to time
正确答案：C
答案解析：从本段最后一句话可知，这个短语与"Sunup to sundown"同义，即日出到日落，也就是从早到晚。
