题文
The average Facebook user in the United States has 245 friends，according to a study ______in February.
| A．publishing |
| B．published |
| C．publish |
| D．to publish |
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The average Facebook user in the United States has 245 friends，according to a study ______in February.
| A．publishing |
| B．published |
| C．publish |
| D．to publish |
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