Through thorough investigation, Dr. John Snow was finally able to prove that the outbreak of Cholera _____ people’s drinking of polluted water.
| A．was close linked with | B．closely linked to |
| C．was close connected with | D．was closely linked with |
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Through thorough investigation, Dr. John Snow was finally able to prove that the outbreak of Cholera _____ people’s drinking of polluted water.
| A．was close linked with | B．closely linked to |
| C．was close connected with | D．was closely linked with |
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