请教一句英语中的问题

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查看11 | 回复1 | 2008-10-3 17:24:29 | 显示全部楼层 |阅读模式
The obvious explanation is that I could not admit had been seen the title without admitting that I had been looking at the things on his desk.
我的问题是为什么上句中look要用ing形式looking.

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千问 | 2008-10-3 17:24:29 | 显示全部楼层
had been doing现在完成进行时...
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