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(shí)態(tài)。句意：當(dāng)他們到達(dá)機(jī)場(chǎng)時(shí)，飛機(jī)已經(jīng)起飛了。可知敘述的是過去某個(gè)時(shí)間已發(fā)生的動(dòng)作，故用過去完成時(shí)態(tài)。選D。
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