Question

--- Did you meet Tom at the airport?
--- No. His plane ______ by the time I ______ there.

1. A.
   has taken off; got
2. B.
   took off; had got
3. C.
   took off; arrived
4. D.
   had taken off; arrived

Answer 1

D
此题考查过去完成时的基本构成。当我到达那里时，飞机已经起飞了。表示在过去的某个时间以前发生的动作或存在的某种状态。