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英語語法突破 200 句
現在完成進行時
1 . Mary has written ten letters today.馬力今天寫了十封信。
2 . How long have you been learning English?你學英語有多久了?
3 . Mary is still writing letters. She's been writing letters all day.馬力還在寫信,她寫了一整天的信。