She has never been to the Great Wall before.Today she saw it ___ the first time.A.at B.for C.in D.
题目
She has never been to the Great Wall before.Today she saw it ___ the first time.A.at B.for C.in D.
She has never been to the Great Wall before.Today she saw it ___ the first time.
A.at B.for C.in D.by
答案是选B,但我想知道A为什么不对.
还有就是这四个选项中的短语都成立吗,如果成立的话该怎么用呢?请分别说明,
答案
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
最新试题
热门考点