It is required that passengers remain ________ when the plane is taking off or landing.
#18805
A
sit
B
seating
C
sat
D
seated
推荐题目
The higher the oil price is, ___________to the global economy.  
#19380
A
the more damage will it cause
B
the more it will cause damage
C
the more damage it will cause
D
the more will it cause damage