问题描述： How often have you been in Greener China?__________ 改错 1个回答 分类：英语 2014-10-24 问题解答： 我来补答 How often have you been in Greener China?_ 改错改为：How long have you been in Greener China 解析：how long 表时间的长度； how often 表频率 展开全文阅读
