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英语语法问题Some time ago,I wrote a letter to you and I wonder if

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英语语法问题
Some time ago,I wrote a letter to you and I wonder if you have received it or not.I have been looking forward to your answer since then.请问为什么要用have been looking forward,用look forward不行吗.
英语语法问题Some time ago,I wrote a letter to you and I wonder if
have been looking forward这是现在完成进时态.
这样表示我从过去给你写信的时刻起到现在一直都期待着你的回应.