Mrs Black has been here for two years.(同义句）
题目
Mrs Black has been here for two years.(同义句）
答案
楼主没有提供变化格式,至少有以下几种：
Mrs Black has been here for two years.
= Mrs Black came here two years ago.
= Mrs Black has been here (ever) since two years ago.
= Mrs Black has been here as long as two years.
= It is two years since Mrs Black came here.
= It has been two years since Mrs Black came here.
= Two years has passed since Mrs Black came here.
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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．
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