当她到达他的办公室的时候，律师正主持一个会议。

When she arrived at his office, the lawyer was presiding over a session.

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当他到达的时候，他发现所有的工作已做完了。

When he arrived, he found all the work finished.

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当他到达车站的时候，他发现他的同学已经离开了。

When he got to the station, he found that his classmate had already left.

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当他到达车站的时候，他发现他的同学已经离开了。

When he got to the station, he found that his classmate had already left.

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