题文
—Have you ever________to a zoo？
—Yes，but only once．I visited Beijing Zoo last year．
| A．gone |
| B．been |
| C．visited |
| D．seen |
—Have you ever________to a zoo？
—Yes，but only once．I visited Beijing Zoo last year．
| A．gone |
| B．been |
| C．visited |
| D．seen |
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