题目内容

It’s suggested that everyone should_______ at least one hour a day to keep fit.
A．work forB．work outC．work at D．work on
B
考查短语辨析。work for 为了什么工作，       work out 算出，锻炼身体，work at 在上班，work on 从事，句意：据建议每个人应该一天至少锻炼一小时来保持健康。所以选B。
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