how long have you done that为什么done 处不能用been doing
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how long have you done that为什么done 处不能用been doing
how long have you done that
为什么done 处不能用been doing
how long have you done that为什么done 处不能用been doing
这个句子的主语是you,been doing是被动,与主语不符,you做主语,应该是主动语态,另外句子的意思是你做了多久才把它完成?是过去完成时,而不是过去进行时,所以此处应该是done
呵呵 高索尼最简单的区别方式
have done 跟have been doing的区别就是
have been doing是之前一直做,做到现在,并且还可能延续下去,而have done 做到现在不持续做下去了 就这样
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