So difficult ____that no one could ___ a good solution to it.
#90783
A
was the problem; come up with
B
the problem was; come up with
C
the problem was; put up with
D
was the problem; put up with
推荐题目
11.-Have you considered ___ your job? -No, I consider my job ____interesting .
#97147
A
to change, to be
B
to be changing, as
C
changing, being
D
changing, /
Please don’t disturb Tom! He is busy now, with a lot of work ____. 
#96265
A
done with
B
to do with
C
doing with
D
to be done with