麻烦曹老师，首先:He will put off the picnic until May 1st, when he will be free. He will put off the picnic until May 1st, on which he will be free.He will put off the picnic until May 1st,and on it he will be free.
... each year than do eBay and Amazon
combined. 这句话想请问：①比较状语从句 than do/be +主语，属于全部倒装还是部分倒装？比较状语从句的倒装完全倒装和部分倒装都可以吗？②combined在这里是什么用法，combined可以是形容词，但是字典上...
Many of the world's great cities are located on rivers, and almost every country has at least one river flowing through it ________ plays an important part in the&nbs...
老师好：请教一下有关定语从句与状语从句的判断，如下：例 1 Studies of both animals and humans have shown that sex hormones somehow affect the stress response, causing females under stress to produce more of the trigger chemicals than do males under the same conditions....
...是定语从句。when
amplifying age……strategy能不能分析成时间状语从句？原因是什么？
pink fully came into its own when amplifying age and sex
differences became a dominant children's marketing strategy这句中“when
amplifying age……strategy”是不是时间状语从...
原句：There must be few questions on which responsible opinion is so utterly divided as on that of how much sleep we ought to have.主要是对这个as on that of 有点懵，不太理解。