______ at the airport, David found his friend had departed.A、When arrivedB、When

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问题 ______ at the airport, David found his friend had departed.

选项 A、When arrived
B、When having arrived
C、When arriving
D、When arrived at

答案 C

解析 when doing sth．表示前后两个动作同时发生，且从句的动词与主句主语是主动关系。

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