he spoke in a low voice in order not to wake the s

问题补充：

he spoke in a low voice in order not to wake the sleeping child如何改为定语从句

答案：

He spoke in a low voice in order not to wake the child who was sleeping.

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======以下答案可供参考======

供参考答案1:

he spoke in a low voice in the purpose of not waking the sleeping child