31.By the time we _____the airport, the plane_____. A．arrived at; had taken off B．had got t.
31.Bythetimewe_____theairport,theplane_____.A．arrivedat;hadtakenoffB．hadgotto;tookoff...
31.By the time we _____the airport, the plane_____. A．arrived at; had taken off B．had got to; took off C．got to; had taken away D．arrived at ; had taken away
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| A |
| 考查时态。By the time主句用完成时态。根据句意我们到达机场的时候，飞机已经起飞了。可知从句用一般过去时，主句用过去完成时，选A。 |
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