问题补充：
The plane when we got to the airport.
A. had taken off
B. was taken off
C. will take off
D. is taking off
答案：
(答案→)A. had taken off
B. was taken off
C. will take off
D. is taking off
解析：考查时态.根据从句内容我们已经到达了机场,可知主句内容在这之前已经发生,故主句用过去完成时态,选A.我们到达机场时,飞机已经起飞了.
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