By the time he arrived at the airport, the plane            .
A．has taken offB．was taking offC．would take offD．had taken off
D
考察時態(tài)。句意：當他們到達機場時，飛機已經(jīng)起飛了�？芍獢⑹龅氖沁^去某個時間已發(fā)生的動作，故用過去完成時態(tài)。選D。
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