He has a hard time          the problem.
#42186
A
works out
B
working out
C
work out
D
works out
推荐题目
--Don’t smoke here. Look at the sign please. –Sorry, I _________it.
#37107
A
don’t notice
B
can’t notice
C
won’t noticing
D
didn’t notice
Mr. White           a lot of places of interest in China .
#39893
A
have gone to
B
has gone to
C
have been to
D
has been to