滨江 水厂 垃圾焚烧:曾经做过谋事怎么翻译
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have ever done something
即用现在完成时:have(has) + 过去分词
used to do something
I have ever done something.
i did something
i have done something
used to do sth
保证是 ,我刚学
As a consultant used to