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31.By the time we _____the airport, the plane_____.
A．arrived at; had taken offB．had got to; took off
C．got to; had taken awayD．arrived at ; had taken away
A
考查時態(tài)。By the time主句用完成時態(tài)。根據句意我們到達機場的時候，飛機已經起飛了�？芍獜木溆靡话氵^去時，主句用過去完成時，選A。
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