来源：学生作业帮 编辑：搜搜考试网作业帮 分类：英语作业 时间：2024/06/15 22:55:42
有两个同义句转换怎样改
1、I started playing tennis when I was seven years old.
I started playing tennis - - - - seven.
2、He joined the army 5 years ago.
He - - - the army for 5 years.
1.at (the age of)
2.has been in
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