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
—Where are Maria and Kangkang?—They _____ England.
#41509
A
have been to
B
are away
C
have gone to
D
had been in
---Would you like to go and see Avatar with me tonight? --- Thank you very much , but I it already.
#41636
A
see
B
will see
C
have seen
D
am seeing
If I ______ free tomorrow, we ________to Beijing Zoo.
#38127
A
am; won’t go
B
is; will go
C
am not; will go
D
am not; won’t go