单选题 When I got to the airport, the plane ______.
A. already took off B. had already taken off C. has already taken off

【正确答案】 B
【答案解析】[解析] 本题考查动词时态。从句是一般过去时，主句“飞机起飞”的动作发生在“我到达”之前，所以主句要用过去完成时，表示过去的过去。