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(xiàng)中was, since改成is, since是正確的；即從句中謂語(yǔ)先發(fā)生。如用B項(xiàng)，是強(qiáng)調(diào)句，而強(qiáng)調(diào)句前后兩個(gè)謂語(yǔ)動(dòng)詞在時(shí)間上必須一致（a）；被強(qiáng)調(diào)部分能還回原句中（b），即因?yàn)榫渲衱as declared是過(guò)去時(shí), B項(xiàng)中is改成was；因?yàn)榫渲衱as declared是非延續(xù)性動(dòng)詞，在years后加上ago將"一段" 時(shí)間變成"一點(diǎn)"就是正確的。C 項(xiàng)前后時(shí)間不一致。
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