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i have been studying history in china 的语法要点
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i have been studying history in china 的语法要点
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语法的要点就是在于have be doing 这个时态的用法了,表示过去在做,并且将要一直做下去的事情,情调持续性但要注意有的动词不能用于进行时,这类词称为短暂性动词,如,open,borrow等等
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