—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．whenC．sinceD．until
A

試題分析：考查連詞辨析。句意：——你知道發(fā)生在市中心的那起事故嗎？——知道。但過了一段時間之后我才知道真相。答案選A。 句型：It was some time before……表示“過了一段時間之后才……”。
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