题文
__________ the train arrived, some people were waiting inside the station __________ others were heading for the platform.
| A．While ； while |
| B．While ； when |
| C．When ； when |
| D．When ； while |
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__________ the train arrived, some people were waiting inside the station __________ others were heading for the platform.
| A．While ； while |
| B．While ； when |
| C．When ； when |
| D．When ； while |
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