参考答案
一、主动填空
1. had played
2. had washed
3. had gone
二、被动填空
1. had been opened
2. had been watered
3. was lost
三、句型改写
1. The desk had been cleaned.
2. The book had been bought.
四、造句
1. I learnt that the schoolbag had been found.
2. I learnt that she had finished her homework.
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