The flu is believed ________ by viruses that like to reproduce in the cell inside the human nose and throat.
| A．causing | B．being caused |
| C．to be caused | D．to have caused |
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The flu is believed ________ by viruses that like to reproduce in the cell inside the human nose and throat.
| A．causing | B．being caused |
| C．to be caused | D．to have caused |
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