—Do you know about the accident which happened in the center of the city?
—Yes. But it was some time we realized the truth.
A. before
B. when
C. since
D. until
网友回答
(答案→)A. before
B. when
C. since
D. until
解析：考查连词辨析。句意：——你知道发生在市中心的那起事故吗？——知道。但过了一段时间之后我才知道真相。答案选A。 句型：It was some time before……表示“过了一段时间之后才……”。