The boy was doing his homework when the phone rang.(改同义句）
网友回答
the phone rang while the boy was doing his homework
======以下答案可供参考======
供参考答案1:
The phone rang while the boy was doing his homework
助你学习进步
供参考答案2:
同义句The phone rang while the boy was doing his homework.
供参考答案3:
While the boy was doing his homework, the phone rang.