Itiswhentheplanethatyou'dbetterfindoutatthebookingofficeA.wouldtakeoffB.hadtakenoffC.wastakingoffD.istakingoff为什么不选择c?

Question

It is when the plane___that you'd better find out at the booking office
A.would take off B.had taken off
C.was taking off D.is taking off
为什么不选择c?

Answer 1

句子的意思是：你最好在售票处问问飞机什么时候起飞.题中用了强调句将when the plane is taking off提前.即 you'd better find out when the plane is taking off at the booking office.主句时态是一般现在时,说明飞机未起飞,因此选D.用现在进行时表示将来.