1. It was difficult to calculate exactly how many trees had been cut down.
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高中英语时态总结：过去完成时By the time课文经典例句
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2. None of them had been lost or damaged.
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3. A few years ago, when very little had been heard of digital computers, it was possible that people were doubtful about them, if one mentioned their properties without describing their construction.
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4. A Sichuan restaurant had been recommended to us by a friend, and finally, we found it.
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5. It was as if our kindly countryside, close to the very heart of England, had been turned into a cruel grassland.
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6. His parents tried to persuade him to stay in the local city to live a life of leisure, but he had already ____ to work in the countryside.
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7. Some were found alive, though they were ____ suffering from terrible injuries, but others had already stopped ____ when they were discovered.
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8. Because the pagoda had already started to tip to one side, people were worried it would collapse if they tried to make any major repairs.
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