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WhenIhurriedtotheairport,theplanewasstartingA.takingoffB.tohavetakenoffC.takenoffD.totakeoff应该选什么?请说明原因,

题目详情
When I hurried to the airport ,the plane was starting ______
A.taking off B.to have taken off C.taken off D.to take off
应该选什么?请说明原因,
▼优质解答
答案和解析
D.TO TAKE OFF
因为句子里用的是the plane was starting,这是过去进行时,过去进行时的后缀一般是动词加ing to do something or to somewhere...