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
----I’m sorry. I’m late for the music presentation.--- Why are you so late? The presentation _______ for 10 minutes.
#41797
A
has begun
B
has stopped
C
has been over
D
has finished
--What a beautiful school!–Yes. Many trees ________ in our school every year.
#39740
A
plant
B
are planted
C
were planted
D
is planted
John _______ at his uncle’s for 3 days and he is now at home.
#41708
A
stayed
B
has stayed
C
had stayed
D
was staying
----- I haven’t heard from Henry for a long time.----- What do you think ___________ to him?
#41739
A
has happened
B
to happen
C
was happening
D
had happened
We aren’t sure of the weather. We _______ sightseeing unless it_________ tomorrow.
#37743
A
will go; won’t rain
B
won’t go; doesn’t rain
C
will go; rains
D
won’t go; rains