has been doing sth+介词

has been doing sth+介词 have(has) been doing sth 造句写翻译 Have/has been 后一定要加doing sth.吗? have been doing sth He has been doing 介词后跟什么介词about后跟sth还是doing sth has been doing 的用法 has been doing的问题, has been doing have been done区别 has been doing还是 has done excuse doing sth中间加什么介词 make a living（ 介词 ）doing sth