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    精英家教网 > 高中英语 > 题目详情
    He ______ it on schedule, but somehow he fell behind.
    A．must have doneB．might finish
    C．could have finishedD．could finish
    C

    试题分析：句意为：他本能够按时完成任务，但他莫名其妙的落后了。must have done 对过去发生的事情的肯定推测，译为“一定---”;might do对现在发生的事情的肯定推测，译为“也许---”语气不十分肯定；could have done意为“本能够---”；could do 用于虚拟语气，对现在或将来的事情虚拟。
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