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?

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It___fiveyears___thewholeprojectwascompleted.A.was;untilB.was;sinceC.took;untilD.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?
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?
选择D
It takes+时间+before是一个固定句型,在.之前一共花费了.时间
有不明白的地方再问哟,祝你学习进步,更上一层楼! (*^__^*)