问题描述：
初二英语改错练习题
1.I wonder if Tom has been here.
2.Just at that moment,Sandy has made a strange machine.
3.I was playing the piano while the young couple came.
4.I have finished the homework before they came.
1.I wonder if Tom has been here.
2.Just at that moment,Sandy has made a strange machine.
3.I was playing the piano while the young couple came.
4.I have finished the homework before they came.
问题解答：
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