It _____ five years since I came to this city.A.was B.is C.will be D.had been正确答案为is,为什么是is .has又行不行呢

现在完成时的题目They left Fuzhou five years ago.=They _____ _____ _____ _____ Fuzhou _____ five years.=It _____ _____ five years _____they _____Fuzhou.=It _____ five years _____ they _____ Fuzhou.改写同意句. She wrote a lot of books five years ago.（保持句意）It _____ _____ five years _____ she ____ a lot of books. he has been in the army for five years同义句 it is fibe years _____ he _____ the army. It is five years since he smoked 12.His income is double _____ it was five years ago.A.that B.which C.as D.whatplease explain In recent years our city has grown so fast that it's at least _____ 10 years ago.A.the size as large as.B .five times size.C.as five times large as .D.five times its size The famous scientist has been _____(death)for five years. He died five years ago同义句Five years ____ ____ ____he died.____five years _____ he died. He worked on it for five years.对for five years提问 in another years是固定短语吗Great changes have taken place in China.Who can tell _____ it would be like in _____ five years.A.how,otherB.what,moreC.what,another 同义句转换He is five years old._____ ______ is five. They left Fuzhou five years ago.同义句转换 ：It __ five years __ they ___ Fuzhou.It __ __ five years __ they __ Fuzhou. It ()five years()i began to study Englishis,began为什么 It is five years ___ Mr Wang ___ the car this is it.five years.you are not alone forever. It (be)five years since I (ride)a bike. it's five years since i______ (join) the League We have been collecting stamps for five years .同义句转换.We ____ _____ stamps five years ago.