31.By the time we the airport the plane.A. arrived at; had taken offB. had got to; took o

问题补充：

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

答案：

(答案→)A. arrived at; had taken off

B. had got to; took off

C. got to; had taken away

D. arrived at ; had taken away

解析：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。