_____ Amy met Peter, she with her mum _______ the bus at the bus station.
| A．When; were waiting | B．When; was waiting |
| C．While; were waiting | D．While; was waiting |
_____ Amy met Peter, she with her mum _______ the bus at the bus station.
| A．When; were waiting | B．When; was waiting |
| C．While; were waiting | D．While; was waiting |
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