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    精英家教网 > 高中英语 > 题目详情
    Not until I read your letter ________ the true state of the affairs.
    A．did I understandB．had I understood
    C．I understoodD．I had understood
    A
    考查倒装。否定结构Not until置于句首时，主句要用部分倒装，由此可以排除C、D两项；此外，understand这一动作和“read”几乎是同时发生的，都发生在过去的某个时间，因此用一般过去时态。故A项正确。
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