你好，很高兴为你解答\(^o^)/~祝你学业有成WhenIarrivedattheairport,hisplanehadtakenoff用过去完成时，因为在从句之前先完成动作。
当我赶到机场时，飞机已经起飞了的翻译是：When I arrived at the airport, the plane had taken off
The plane had taken off by the time he got to the airport .
The airplane had taken off by the time he arrived at the airport.
When I reached the airport，the plane had taken off.
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Elaine暖阳
