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    精英家教网 > 高中英语 > 题目详情
    By the time some scientists ____ the lost towns, they ____ an awesome historical site.
    A．had found, had foundB．found, found
    C．found, had foundD．had found, found
    C

    试题分析：考查时态。By要和完成时连用，如果by后面的句子使用一般过去时，主句使用过去完成时的形式。句意：到一些科学家分析那些失踪的城镇的时候，他们已经发现了这些有历史意义的遗址。故C正确。
    点评：连词by到…时为止；该词经常与完成时连用，如果后面是现在的时间，句中就使用现在完成时；如果后面是过去的时间，就使用过去完成时；如果后面是将来的时间，就使用将来完成时。
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