A balloon             as it is filled with air.
#102647
A
is increased
B
increases
C
expands
D
is expanded
推荐题目
The old man was taking a walk, ____ by his grandson. 
#104560
A
supporting
B
supported
C
being supported
D
having supported
I got caught in the rain and my suit______. 
#102751
A
has ruined
B
had ruined
C
has been ruined
D
had been ruined