Millie has lived with Eddie( ) A.when she was born B.since three years C.for three years
题目
Millie has lived with Eddie( ) A.when she was born B.since three years C.for three years
D.afer she was born
答案
因为是现在完成时、所以有两种、一个是since 一个是for
since后加时间点、也就是说three years ago
而for 后加段时间、比如three years
希望能帮到楼主咯~
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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