1, When Kangkang was writing a letter, someone knocked at the door.
2, While the boys were playing basketball, the girls were singing.
3, We'll talk about it before we make the decision tomorrow.
1 Kangkang was writing a letter when someone knocked at the door.
2 The boys were playing basketball while the girls were singing.
3 We'll talke abut it before we make the decision tomorrow.
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