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用while或when填空 1.------ I was watching TV,the bell rang.

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用while或when填空 1.------ I was watching TV,the bell rang.
2.------- her year was over,she said that she would return to the area after finishing her studies.
3.------- the fire broke out,all the students were sleeping soundly.
4.Father was preparing a report ------ I was playing PC games.
用while或when填空 1.------ I was watching TV,the bell rang.
1、when/while都可以,同时发生的.
2、when表当什么时候
3、while/when都可以
4、while表转折