31.By the time we _____the airport, the plane_____.
A．a(chǎn)rrived at; had taken offB．had got to; took off
C．got to; had taken awayD．a(chǎn)rrived at ; had taken away
A
考查時(shí)態(tài)。By the time主句用完成時(shí)態(tài)。根據(jù)句意我們到達(dá)機(jī)場的時(shí)候，飛機(jī)已經(jīng)起飛了�？芍獜木溆靡话氵^去時(shí)，主句用過去完成時(shí)，選A。
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