问题描述：
Having been used for a long time,the computer needs repairing.
1 Having been used for a long time,the computer
needs repairing.
2 To have been used for a long time,the computer
needs repairing.
3 Used for a long time,the computer
needs repairing.
三个哪个是对的?why
1 Having been used for a long time,the computer
needs repairing.
2 To have been used for a long time,the computer
needs repairing.
3 Used for a long time,the computer
needs repairing.
三个哪个是对的?why
问题解答：
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