对比这两题英语单选
题目
对比这两题英语单选
a large crowd of supporters sang him,"happy birthday".definitely the most exciting birthday---
a.before b alread c ever d since
i thought horseback riding would be the sport for me until i fell down from the horse back,as you can imagine,i haven't been invited back ----
A.later B.since C.after D.ever
比较这两题
答案
1.C ever在任何时候;从来;至今
2.B 自从我从马背上摔下来后,再也未参加骑马运动.since :adv 从…以后.故选B.
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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