Up to now, they _________ a good way to solve that problem.
#102584
A
didn’t find
B
can’t find
C
hadn’t found
D
haven’t found
推荐题目
The construction of the two new railway lines   by now.
#99633
A
have been completed
B
has been completed
C
has coompleted
D
have completed
I am so tired,for I ________ English for 2 hours.
#99761
A
is studying 
B
have been studying
C
was studying 
D
had been studying