How many lessons do you usually have a day?—Six lessons a day,and each of then____45 minutes
题目
How many lessons do you usually have a day?—Six lessons a day,and each of then____45 minutes
A last B lasts C have D are 为什么要选B
答案
last是持续的意思,也就是一节课持续45分钟.然后each(每节课)要跟动词第三人称单数搭配,所以要加S
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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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