It _____ quite a few years _____ the accused was declared innocent and set
free.
A．was; sinceB．is; thatC．will be; whenD．was; before
D
如將A項中was, since改成is, since是正確的；即從句中謂語先發(fā)生。如用B項，是強(qiáng)調(diào)句，而強(qiáng)調(diào)句前后兩個謂語動詞在時間上必須一致（a）；被強(qiáng)調(diào)部分能還回原句中（b），即因為句中was declared是過去時, B項中is改成was；因為句中was declared是非延續(xù)性動詞，在years后加上ago將"一段" 時間變成"一點"就是正確的。C 項前后時間不一致。
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