初中英语必备词组：all alone

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all alone 单独、独自

【例句】

She was sitting all alone in the classroom. 她独自一人坐在教室里。

There being no one to help me, I had to do it all alone. 因为没有人帮助我，我不得不独立完成这项任务。

句型转换

She was sitting all alone in the classroom.（保持句意不变）

She was sitting all by ______ in the classroom.

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