since doing 和 since having done 用法疑惑？ - 柯帕斯英语网

since doing 和 since having done 用法疑惑？

The United States has reduced its forces there to around 8600 since signing the deal with the Taliban in February.

这里的since signing...意思是自从签署了...那么为什么不用since having signed 完成时呢？

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分类：介词用法

最佳答案 2020-10-15 16:31

为什么要用动名词完成体呢？没有必要。sign在此为非延续性动词，sence signing...本身就是从signing动作结束的时候算起。

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曹荣禄 -

擅长：动词用法,句法问题 | 采纳率 82% | 回答于 1秒前

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Long2019 提出于 2020-10-06 17:59