They have stayed with host families in Beijing for a week

问题描述:

They have stayed with host families in Beijing for a week

他们寄居在东道主家在北京呆了一周

他们已经在北京的接待家庭里住了一周了

他们已经在北京接待的家庭里住了一周了.

他们在北京接待家庭里已经呆了一个星期了。