1.I did see their car yet.2.I have received this letter last month.3.They were never to China before
题目
1.I did see their car yet.2.I have received this letter last month.3.They were never to China before
4.She has telephone me ten minutes ago.5.Did you go to the garage lately?用正确时态改写下列句子.12点之前~
答案
I haven't seen their car yet.I received this letter last month.They have never been to China before.She telephoned me ten minutes ago.Have you been to the garage lately?
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已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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