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    1. They _______ (do) the work by five o’clock.

    2. By the time he was 14 he ________ (set up) a small chemistry lab of his own.

    3. It was the third time that he _______ (tell) a lie.

    4. It seemed that he ________ (know) the news.

     

    答案：
    解析：

    		1. had done         时间状语为过去的一个时间段，故使用过去完成时。

    2. had set up        同1。

    3. had told         it is the third time that后面的从句一般使用完成时态，因前面是过去时，故本题使用过去完成时。

    4. had known       从语意及前面的时态上可知应使用过去完成时。

     


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