将后面的句子还原应该是they invite tweleve homeless people to stay in Friends' House every night.
Friends' House为中心词,改成定语从句是如果stay后面有in就用which,没有in用where,in which = where
所以,in which they invite.
or where they invite twelve
that不可以用在非限制定语从句里面
将后面的句子还原应该是they invite tweleve homeless people to stay in Friends' House every night.
Friends' House为中心词,改成定语从句是如果stay后面有in就用which,没有in用where,in which = where
所以,in which they invite.
or where they invite twelve
that不可以用在非限制定语从句里面