something difficult for me...

It took me less time to fly to xi'an than it ____________there.A,did to drive B.did driving C,was driving  
我想选A,但B 我觉得也说得通,过去的状态    C应该是错的,但我有点说不清具体拿错>>>>>*-*

答案是A
本句是比较级，前后 to fly与to drive 应该一致。     did 后面不能跟driving 。