. Ladies and gentlemen, please remain ________ until the plane has come to a complete stop. 
#98550
A
seated
B
seating
C
to seat
D
seat
推荐题目
Though trying really hard, they acknowledged ____ at last.
#94691
A
defeated
B
defeating
C
having defeated
D
having been defeated
The retired worker likes getting up early. The air in the morning is good ______. 
#88421
A
being breathed
B
breathing
C
to be breathed
D
to breathe
The children talked so loudly at dinner table that I had to struggle ____.
#95993
A
to be heard
B
to have heard
C
hearing
D
being heard