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She went on holiday after she had taken the exam.
她考试后度假去了。
I ran to the platform quickly, but the train had already left.
我赶快跑到站台上,但是火车已经开走了。
We had had dinner before they arrived.
他们到达之前我们就已吃饭了。
The patient had died when the doctor arrived.
大夫到达时病人已经死了。