They have been here for two days.(改为同义句)
问题描述：
They have been here for two days.(改为同义句)
They _____ here two days _____.
答
They _were__ here two days _ago__.可以讲解一下吗？They have been here for two days.
他们在这里有两天了。（意思是说，他们两天前来这里。）
所以上面我给的答案最好改为：
They _came__ here two days _ago.