You must be firm ( )you think yourself to be right.括号中为什么用where而不是on which
题目
You must be firm ( )you think yourself to be right.括号中为什么用where而不是on which
Each boy and girl who (are )to visit Hengshui Middle School in Heibei Province ( is ) asked to be at the bus station at 6:30.括号里的be动词为什么单复数不同?
答案
有each,不管后面是单复都用单,所以后面那个是is,前面的are是因为who的关系代词是boy and girl为复数,所以是are
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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．
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