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to having been doing 和having been doing 的区别
还有he went to the front door,his son following hin里的following 的语法解释,
人气:234 ℃ 时间:2020-05-11 18:14:06
解答
前一个是即将做,还没做.而后一个是做过了的意思.这种语法现象适用于各种地方
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