has worked是现在完成时,现在完成时后面跟since引导的时间点。has been working是现在完成进行时,一般强调动作进行的时候选择完成进行时,后面跟for引导的一
My Mum has worked in this school for over 20 years.My Mum ha
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词性转换,英文好的进来哦!He has worked in this school for twenty years a
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