题文
Since he downloaded a virus ________ into his computer, he can’t open the file now.
| A．by design |
| B．by accident |
| C．on purpose |
| D．by mistake |
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Since he downloaded a virus ________ into his computer, he can’t open the file now.
| A．by design |
| B．by accident |
| C．on purpose |
| D．by mistake |
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