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
Students taking the course _____to finish their homework with the help of computers．
#103877
A
are encouraged
B
have encouraged
C
are encouraging
D
had been encouraged
Catherine is one of the brightest students who from the Department of Computer Science , Brown University .
#103837
A
is graduated
B
has graduated
C
are graduated
D
have graduated
The monkey was so lucky that it just missed ______ .
#103712
A
catching
B
to be caught
C
being caught
D
to catch
Scientific surveys conducted during the climbs that Mount Huandoy in Peru 6395 meters high.
#104255
A
shown；is
B
showed；was
C
shows；was
D
showed；is
In the near future, more advances in cloning technology by scientists.
#100756
A
are making
B
are made
C
will make
D
will be made