This is the hotel____ last month

问题描述:

This is the hotel____ last month
1.which they stayed
2.at that they stayed
3.where there stayed at
4.where they stayed
要不要加at?

改正:
1.which they stayed at
2.at which they stayed
3.where there stayed
4是正确的
which要加at
where不用
where可以相当于at which