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31.By the time we _____the airport, the plane_____. A.arrive

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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
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。