He opens the door as quickly as he could.
题目
He opens the door as quickly as he could.
这句话对吗?
答案
He opened the door as quickly as he can.
开门这个动作时瞬间动作,肯定已经发生过了,用一般过去时.
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
最新试题
热门考点