题目内容
By the time he arrived at the airport, the plane .
A.has taken off | B.was taking off | C.would take off | D.had taken off |
D
考察时态。句意:当他们到达机场时,飞机已经起飞了。可知叙述的是过去某个时间已发生的动作,故用过去完成时态。选D。
练习册系列答案
相关题目