问题描述：
recall 可以与back 连用吗
I _____ back and wondered what would have happened if .
答案是thought,那为什么 recall不可以?因为有back吗?
I _____ back and wondered what would have happened if .
答案是thought,那为什么 recall不可以?因为有back吗?
问题解答：
我来补答展开全文阅读