Viết lai câu sao cho nghĩa ko đổi: She washed her hair before she went out ( Going)

( Sửa đề: washed `->` had washed )

Đáp án: Before going out, she had washed her hair.

`@` Kiến thức :

`-` Before + simple past, past perfect: trước khi .... thì

`=>` Before + V-ing ( đồng chủ ngữ ) , past perfect