--- What do you think of the math problem ? --- It’s very hard and nobody has _______.
#57830
A
put it out
B
helped it out
C
worked it out
D
solve
推荐题目
---What he enjoys _____ great and interesting. ---Yes,____ it's dangerous.   
#59268
A
sounds, but
B
to sound, but
C
sounds, so
D
to sound ,so
Andrew enjoys ___________ very much.
#52101
A
play football
B
playing football
C
playing the football
D
to play football
I often saw the boys     in the river.
#53082
A
swam
B
swimming
C
to swim
D
swim