How many hours is it going to take Stephanie to get to Los Angeles?
题目
How many hours is it going to take Stephanie to get to Los Angeles?
Could you tell me what kind structure this sentence is What is the "it" instead?
答案
句型是it takes/ will take sb some time to do sth
变成问句就是how many hours will it take sb to do sth?
it代替后面的to do sth
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
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