The scientists ________ on the new medicine for two years. They will succeed in no time.
#38384
A
work
B
are working
C
have worked
D
will work
推荐题目
---Millie, where is Miss Li?---She _________ a speech on Chinese art to the first-year students in the hall.
#39154
A
gives
B
gave
C
is giving
D
has given
—What did you do before you came here? —I in a factory.
#41541
A
worked
B
am working
C
will work
D
work
Our teacher told us that light _____ much faster than sound.
#41507
A
traveled
B
travels
C
is traveling
D
was traveling
What ________ you ________ at this time yesterday?
#37876
A
did, do
B
have, done
C
were, doing
D
are, doing