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Global Health officials have been closely monitoring a new virus related to SARS

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Global Health officials have been closely monitoring a new virus related to SARS

 Global Health officials have been closely monitoring a new virus related to SARS that is believed ______ at least one person in Saudi Arabia.

  A. to kill                    B. to be killing               C. to have killed            D. kill

试题答案

C

标签：relatedvirusnewthatsars

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