---I haven't written a letter to him for a long time.how about you?--Well,I____just now.A.i wrote it B.wrote one C.did it D.did one请详细说明原因，为什么不选D

---I haven't written a letter to him for a long time.how about you?--Well,I____just now.A.i wrote it B.wrote one C.did it D.did one请详细说明原因，为什么不选D
---I haven't written a letter to him for a long time.how about you?--Well,I____just now.
A.i wrote it B.wrote one C.did it D.did one
请详细说明原因，为什么不选D

---I haven't written a letter to him for a long time.how about you?--Well,I____just now.A.i wrote it B.wrote one C.did it D.did one请详细说明原因，为什么不选D
B.wrote one

did 已经包括one了，所以应该选B

C.did it
前面已经出现written a letter（写信）,后面一般用DID代替， 避免重复
绝对用DID，“did是过去式，时态不符。”那A选项的wrote不是过去式了么？？？
one是范指，it为特指。 前面都提到写信了，后面肯定不能再出现写信了，英语里面很忌讳句子前后的重复。。。。。。。...

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C.did it
前面已经出现written a letter（写信）,后面一般用DID代替， 避免重复
绝对用DID，“did是过去式，时态不符。”那A选项的wrote不是过去式了么？？？
one是范指，it为特指。 前面都提到写信了，后面肯定不能再出现写信了，英语里面很忌讳句子前后的重复。。。。。。。

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选A。 题干的意思是：我很久都没给他写信了，你有没有给他写？ 回答为：我正在写。 did是过去式，时态不符。one是范指，it为特指。前者意为：我在写一封信(其信可以给任何人)。后者：我在给他写信。

如果选D，应去掉one，写信怎么能用do呢！
应该选B，one表示泛指！