has been doing还是 has doneshe loves her students,——————————————— all her time for the past three years.答案是has devoted 我写的has been devoting

i has been doing 还是i have been doing has been doing have been done区别 has been has difficulty doing sth还是has difficulty to do sth Have/has been 后一定要加doing sth.吗? have /has been doing 是什么句型啊做题时遇到的 翻译句子：he has been doing nothing else ever since. have(has) been doing sth 造句写翻译 That we are doing has never been done before.改错 sth has changed 还是 sth has been changed They have been doing their homework能改成：he has been doing their homework 吗?have改成了has had been doing是什么语法?举个例子~有have/has been doing的说法吗? Where has your cousin_____?gone还是been 这句话中has been away是谓语,还是has?还是been?还是has been?还是away?he has been away from home for months have/has+been doing 与has/have+过去分词的区别 过去现在时 have /has been doing和have/ has +过去分词的区别 he _____ research these three years,and he ___several discoveries this year.a.has been doing ,made b.has been doing ,has made.能否说明原因？ has always has always been