could have done 和 should have done的用法是否一样?
题目
could have done 和 should have done的用法是否一样?
答案
could have done ：过去本来能够做到（某事）却没有做.例如You could have finished your homework yesterday,but you played too much.should have done：过去本来应该做（某事）却没有做.例如：You should have be...
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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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