He studied in the USA for three years这道题是对划线部分提问,从for 到years )为划线部分

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He studied in the USA for three years这道题是对划线部分提问,从for 到years )为划线部分

He studied in the USA for three years这道题是对划线部分提问,从for 到years )为划线部分
He studied in the USA for three years
这道题是对划线部分提问,从for 到years )为划线部分

He studied in the USA for three years这道题是对划线部分提问,从for 到years )为划线部分
How long did he study in the USA ?