什么时候用have什么时候用was_什么时候用have什么时候用was

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The Next Step for Shandong-Europe Economic and Trade CooperationRecently, the 2026 SEE Qingdao Forum was held in Qingdao, Shandong, under the theme “SOEs, Private and Foreign Enterprises: Innovation Together for High-Quality Development”. The forum has been held seven times, and for the first time, the State-owned Assets Supervision and A...

你同学打电话那会儿你在干啥?这道题,90%的人栽在“starting”上所以C错在:时态一致性与时间参照点原则 + 完成时态与过去时间状语的匹配。举例:“When I called, she had left”对,但“When I called, she has left”错,因为has left是现在,when I called是过去,不能共存。 选项D. was starting,过去进行时。这就是正确答案。为什么?因为整个句子设定的时...

动作未发生用to do,动作已完成用doing/to have doneI will be sorry _this company, but I was offered an opportunity _in a field which I really enjoy. A. for leaving: to have workedB. to leave: to workC. fo... 第一空to have left,不定式完成式to have done表示动作发生在主句谓语之前,I will be sorry to have left含义是等到将来某个时刻,回头为当初离开这...

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