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过去完成时用来描述一个在过去某个时间之前就已经发生的动作或存在的情况，指过去的过去。
The movie had already started when I arrived at the cinema.
我到电影院的时候，电影已经开演了。
They completed the project earlier than we had expected .
他们比我们预期的更早一些完成了这个工程。
It suddenly occurred to him that he had not locked the door.
他突然想起来自己没有锁门。
现在完成时的结构
注： had not = hasn’t
请将下面每个句子中的错误改正，每题只有一处错误。
1. They have made a reservation in the new restaurant but they cancelled it just now.
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2. Jason had gave a much better speech than we had expected.
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3. I almost forgot that I already sent an email to Linda.
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4. No one had told me that the shop had closed.
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5. I phoned Katie but she left the office.
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