She kept _________ hard at her physics and finally caught up with us.  
#53052
A
work
B
worked
C
working
D
to work
推荐题目
---My hobby is       old coins, what about you?---In my free time, I like      in the park.
#62630
A
collected; painting
B
collects; to paint
C
collecting; to paint
D
collect; painting
Oh, these shoes are so beautiful! Can I ________?
#58808
A
try it on
B
try on it
C
try on them
D
try them on
---- Would you mind _______ a few questions about caring for hair ? ---- ________________ .
#57971
A
to answer, please don’t
B
answering, Certainly not
C
to answer, Of course not
D
answering, At all