Please remain          until the plane has come to a complete stop. 
#97891
A
to seal
B
to be seated
C
seating
D
seated
推荐题目
The two elderly sisters, ____ so long, held each other.
#94639
A
being separated
B
having been separated
C
to be separated
D
had been separated
Your composition is good but your handwriting still requires   .
#97781
A
improving
B
improved
C
being improved
D
to improve