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 |
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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 |
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