Question

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.

 

Answer 1

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。