_____，memories of staying abroad as an exchange student flooded into his mind.
| A．Listening to these songs |
| B．Having listened to these songs |
| C．He was listening to these songs |
| D．When he listened to these songs |
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_____，memories of staying abroad as an exchange student flooded into his mind.
| A．Listening to these songs |
| B．Having listened to these songs |
| C．He was listening to these songs |
| D．When he listened to these songs |
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