he said that it would be possible to build a platform.This platform would serve as a port and a rail
题目
he said that it would be possible to build a platform.This platform would serve as a port and a railway station.后面一句为什么要用would?这是虚拟吗?
答案
过去将来时,与前面保持一致
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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