下面几种表达哪些是对的?六个月后：in six months,after six months,six months l

下面几种表达哪些是对的?六个月后：in six months,after six months,six months l six months ago/for six months six months earlier是什么意思 six months earlier和six months ago 有区别吗 I have been in china six months等于 （ ）（ ）six months since I c 英语翻译a.six months of training b.six- months training c.six mo after six months of training= after six-month's training? 翻译six months of flying courses lay in ahead of Deliver the goods within six months? Agreement for a period of six months! He has been there for six months. He has been there for six months