题目内容

It _____ quite a few years _____ the accused was declared innocent and set
free.
A．was; sinceB．is; thatC．will be; whenD．was; before
D
如将A项中was, since改成is, since是正确的；即从句中谓语先发生。如用B项，是强调句，而强调句前后两个谓语动词在时间上必须一致（a）；被强调部分能还回原句中（b），即因为句中was declared是过去时, B项中is改成was；因为句中was declared是非延续性动词，在years后加上ago将"一段" 时间变成"一点"就是正确的。C 项前后时间不一致。
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