great changes----in our city in the past three years 1took place 2have taken place 2have taken place
题目
great changes----in our city in the past three years 1took place 2have taken place 2have taken place
3were taken place 4have been taken place
急-----------
理由
答案
2 in the past three years 用现在完成时
take place是不及物动词,没有被动语态的,所以选2
举一反三
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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