WHEN have you been to BEIJING?这句话对吗
题目
WHEN have you been to BEIJING?这句话对吗
答案
如果是问人什么时候去过北京,应该直接问When did you go to Beijing?或者When were you in Beijing?
When have you been to Beijing?这个说法我说不好是对是错,反正我从来没见过
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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