I had bought the new MP3 for three days, 你要表达的是前三天你就买了这个mp3,
如果用 I have bought the new MP3 for three days, 你要强调的是你告诉别人你现在有MP3了.
其实I have bought / I had bought 都没错,for three days 改为 three days ago更为恰当.
I had bought the new MP3 for three days, 你要表达的是前三天你就买了这个mp3,
如果用 I have bought the new MP3 for three days, 你要强调的是你告诉别人你现在有MP3了.
其实I have bought / I had bought 都没错,for three days 改为 three days ago更为恰当.