Ladies and gentlemen, please fasten your seat belts.The plane .
A. takes off
B. has taken off
C. is taking off
D. took off
网友回答
A. takes off
B. has taken off
(答案→)C. is taking off
D. took off
解析：考查时态，本题中考查的是现在进行时代替将来时，现在进行时代替将来时表示的是按照事先安排好的事情，且动词必须是一些表示位置变化的动词。本题均符合。句意：先生们，女士们，请系好安全带，飞机马上就要起飞了。故C正确。