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 film______for ten minutes when we got to the cinema.
#37520
A
has alrealy been on
B
has already begun
C
had already been on
D
had already begun
Great changes         in China since 1978.
#39803
A
took place
B
has happened
C
have taken place
D
happened
You will _______ if you _______ late again, I think. 
#42006
A
punish; will come
B
be punished; will come
C
punish; come
D
be punished; come
The boy fell asleep where he ______,without undressing. 
#63710
A
was laying
B
was lying
C
had laid
D
had lied