The computer -----by him for three years?A was kept B has been had
题目
The computer -----by him for three years?A was kept B has been had
答案
选B.for 表示一段时间,可以与完成时态连用.意为：他已经占有（使用）这台电脑三年了.
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．
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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