A.The plane is delayed by the late arrival of some passengers.B.The plane is delayed by some mechanical failure.C.The weather does not allow the plane to take off.D.The luggage of some passenger is dangerous.
A.The plane is delayed by the late arrival of some passengers.
B.The plane is delayed by some mechanical failure.
C.The weather does not allow the plane to take off.
D.The luggage of some passenger is dangerous.