问题
单项选择题
By the time we hurried through the heavy traffic to the airport, the plane ______.
A．was taking off
B．would take off
C．had taken off
D．took off
答案
参考答案：C
解析：[分析] 此题考点为动词时态。By the time紧跟的从句是过去时，主句的谓语须为过去完成时，所以C是正确答案。本句的意思是：“当我们匆匆忙忙通过拥挤的街道赶到飞机场时，飞机已经起飞了”。