(2013·凉山一模)Life is like riding a bicycle. ________ your balance, you must keep moving.
#89279
A
Keeping
B
To keep
C
Keep
D
Being kept
推荐题目
She was the first woman ______ to the board.
#94213
A
to be appointed
B
having been appointed
C
appointing
D
to appoint
___________ in the leg made it impossible for me to walk as fast as usual.
#90872
A
Being injured
B
To be injured
C
Having injured
D
Injured