so提前的部分倒装句：So much of interest does Beijing offer that most visitors simply run out of time before seeing it all.
正常语序：Beijing offers so much of interest that most visitors simply run out of time before seeing it all.
对于此句有两个问题：
1、为什么倒装句里提取助动词did后面offer要用原形.
2、simply在这里的词性、意思以及修饰什么.
上面问题1打错了 是助动词does