Jim has made many friends since he ____to China,Acame Bcomes Chas come Dwill come
题目
Jim has made many friends since he ____to China,Acame Bcomes Chas come Dwill come
答案
A has made 表示是从Jim 来到中国这一个时间点开始,到现在为止,他交了很多的朋友.所以,since后面跟一般过去时.
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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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