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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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