介绍:
Unit21
1. He asked who had taken his dictionary.
2. I realized that I had made a serious mistake.
3. We found that somebody had broken our window.
4. My brother told me that some bridges had been washed away.
5. He showed me the article he had written.
6. This was the first time he had ever been late.
7. This was the necklace my mother had left me.
8. She was very excited as she had never been to a dance before.
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