teyvhf

840 - cost的常用用法：sth cost(v.) sb time/money to do；the cost(n.) to sb of doing sth；the cost(v.) of；D的错误在于A结构中the cost of中of表达的是属性，而the cost to ... of打破了这个结构；另：此题好像是OG补充的一个题目，可参见OG解释；

9 - even as = just as 这是固定搭配