I moved to the U.S.A last year.（同義句）
It is （one year） since （I moved to） the U.S.A
自從我搬到美國(guó)已經(jīng)有一年光景了.改成完成時(shí)是另外一句？
I have lived in the USA for one year.不是另一句，就是it is ____ _____since ____ _____ the U.S.A我們藍(lán)天書上的怎么可能！連動(dòng)詞is都給了，還能寫出現(xiàn)在完成時(shí)嗎？
現(xiàn)在完成時(shí)是have\has+過(guò)去分詞。例句It is the first time i have seen the movieIt is one year since I've lived\been in the USA.
since后面應(yīng)該是3個(gè)空。