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        1. 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(dāng)他們到達(dá)機(jī)場時,飛機(jī)已經(jīng)起飛了。可知敘述的是過去某個時間已發(fā)生的動作,故用過去完成時態(tài)。選D。
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