While I was in the Disneyland，I saw some children________in the roller coaster，laughing happily．
| A．sit |
| B．sat |
| C．to sit |
| D．sitting |
While I was in the Disneyland，I saw some children________in the roller coaster，laughing happily．
| A．sit |
| B．sat |
| C．to sit |
| D．sitting |
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