Question

I had been looking for the book for two days________I found it at last. A.until B.when C.before

能说说这3个次具体用在什么地方吗？

Answer 1

答案为C,从时态判断，我一直在找发生在我找到之前（过去完成时表过去的过去），整句译为那本书我找了两天才找到。before除了"在...以前"的意思，还有"才"的意思。until是"直到...才..." when是"当...时候".

Answer 2

因为主句是用的过去完成时，所以时间提示为
c

Answer 3

C

Answer 4

B