He has a hard time          the problem.
#42186
A
works out
B
working out
C
work out
D
works out
推荐题目
 The students       the Art Festival when I passed by their school.
#41616
A
celebrate
B
were celebrating
C
will celebrate
D
have celebrated
 –Where are you going for your holiday?--Well, we _______ yet.
#42779
A
haven’t decided
B
hadn’t decided
C
don’t decide
D
didn’t decide
When it rains, she ______ a bus to work.
#39682
A
is taking
B
taking
C
takes
D
to take