题目内容

It was some time       we realized the truth．
A．whenB．untilC．sinceD．before
D

试题分析：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。
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