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

試題分析：句意：一段時間后我們才意識到真相。it指時間，when當……時；until直到……才；since自從……以來；before在……之前。結合句意判斷，選D。 
考點: 考查連接詞的用法。
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