It was some timewe realized the truthA. whenB. untilC. sinceD. before

问题补充：

It was some timewe realized the truth．

A. when

B. until

C. since

D. before

答案：

A. when

B. until

C. since

(答案→)D. before

解析：句意：一段时间后我们才意识到真相。it指时间，when当……时；until直到……才；since自从……以来；before在……之前。结合句意判断，选D。

考点: 考查连接词的用法。