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    精英家教网 > 高中英语 > 题目详情
    Only after they had carried out over ten experiments ______ the decision.
    A．they reachedB．they reachC．did they reachD．do they reach
    C

    这题考查部分倒装句的用法，当“only+状语”位于句首时，主句用部分倒装，即把助动词、情态动词、be动词放在主语前面，另外注意前面的过去完成时，横线处用过去时，所以选C。
    句意是：只有在他们做了十个实验后，才下了决定。
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