问题描述：
1.Mary is a student.画线句提问 划线部分是Mary 2.l
1.Mary is a student.画线句提问 划线部分是Mary 2.l went back beceucse the door dosed.划线部分是beceucse the door dosed
1.Mary is a student.画线句提问 划线部分是Mary 2.l went back beceucse the door dosed.划线部分是beceucse the door dosed
问题解答：
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