It___five years ___the whole project was completed.A.was;until B.was;since C.took;until D.took;before为什么答案是D?

It___five years ___the whole project was completed.A.was;until B.was;since C.took;until D.took;before为什么答案是D? Sorry,I ___t your name. I can't tell you.It's a ___t. Excuse me,___t where is class2,Grade 只需填两个字母 years It___five years___I begin to study Engshin. A.was;since B.has been;since C.is;after D.Is;before我知道答案是D,可为什么B不对? 英语翻译years. ninteen years three years years是什么意思 GREEN YEARS four years tow years Four Years many.Years. 5 years Years of overlapping years