Frank works hard and he often studied until at night和Frank works hard and he often studies late at n
题目
Frank works hard and he often studied until at night和Frank works hard and he often studies late at night哪句话才是对的
要说明原因,不要只告诉我那句是对的,,谢谢啦
答案
第二句是对的,第一句中until和at两个介词的使用是一个极大的错误,两个介词不可以一起使用,必须分开.
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