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

試題分析：句意：一段時(shí)間后我們才意識(shí)到真相。it指時(shí)間，when當(dāng)……時(shí)；until直到……才；since自從……以來(lái)；before在……之前。結(jié)合句意判斷，選D。 
考點(diǎn): 考查連接詞的用法。
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