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请教英语语法(2007.12.20-1)MywifeandIwereattherace.Thereweretwentycarsintherace.1..为什么一行用at,而第二行就in呢?

题目详情
请教英语语法(2007.12.20-1)
My wife and I were at the race.
There were twenty cars in the race.
1..为什么一行用at,而第二行就in呢?
▼优质解答
答案和解析
主语是生物(人,动物等)就用at
反之是in