People working 10 or 11 hours a day are more likely to suffer from heart problems than_____ who go off duty after seven hours．
| A．those | B．that | C．these | D．them |
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People working 10 or 11 hours a day are more likely to suffer from heart problems than_____ who go off duty after seven hours．
| A．those | B．that | C．these | D．them |
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