it is three years since i have seen him
题目
it is three years since i have seen him
it is three years since i saw him
有什么不同.表达效果还是意思什么的?
答案
It is three years since I have seen him我已经三年没见过他了.(见他这一动作持续三年都没有发生过,直到现在.)since 后是现在完成时It is three years since I saw him自从我见到他以来已经三年了.(从过去见到他...
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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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