i has been doing 还是i have been doing
i has been doing 还是i have been doing
has been doing have been done区别
i have been to和i have been doing 和i have been.区别
has been doing还是 has done
have /has been doing 是什么句型啊
have/has been doing否定形式
have /has been doing 是什么时态
He has been doing
英译汉一句话I have not been doing much of anything.
have been doing sth
What have I been doing for the past 20 years that’s been so
have been done 和 have been doing