Have you been to China?和Have you ever been to China 都是一样的意思吧?这么问都对吧?

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• have been study 为什么不说have studied ,have been absent 为什么不说have absented1 have been study 和 have been absent最常见到,既然不是被动语态（主语是人）,为什么不直接用have + 动词过去分词的形式呢?2 have absented 我也看到过 不知道和have been absent 有什么区别（study和absebt在这都不做动词用了这我知道,我就是不知道为什么要这么用,是习惯用法吗?）3 另外 how long has she been study与 how long has she been studying只有语境上去区别对吧,意思都是一样的,用studying强调还会继续学习下去,但是study在这也暗示会继续学习下去吧.
• - John,you have never been to the great wall since you came to china,i am afraid.-_____a,yes ,never ,how about you?b,no,but how i wish toc,yes,but i'd like to as soon as possible原句意思是：恐怕自你来中国还没去过长城吧!我觉得应选含yes 的,意思是 是的,没去.若选no,就代表不,已经去过了
• Have you been to China?和Have you ever been to China 都是一样的意思吧?这么问都对吧?
• 正达美-英语语法问题-我觉得这个have been是个好奇怪的东西啊?你看如果我说 how long have you been Beijing那意思就是问,“您在北京待了多久了?”而且这个人现在还在北京 这绝对没错,我们外教说的如果我说I have been Beijing 那意思就是我去过北京,但是现在肯定已经不在北京了对吧?英语里,同样都是have been就能表示两种不同的语境呢?
• Have you been to China?和Have you ever been to China 都是一样的意思吧?这么问都对吧?
• 一个环形的外圆直径是8分米,内圆直径比外圆直径少1/4,这个环形的面积是( )平方分米
• I make every effort to study.这句话有语法错误码?