While playing basketball,he fell down and hurt his knees.改写：While basketball,he fell down and had his knees hurt.

分类: 作业答案 • 2022-01-02 15:18:42

问题描述：

While playing basketball,he fell down and hurt his knees.
改写：While basketball,he fell down and had his knees hurt.

答

While he was playing basketball,he fell down and had his knees hurt.