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
---You were out when I went to your house this morning. ---Oh, I _______ for a friend from England at the airport.
#40468
A
was waiting
B
waited
C
am waiting
D
have waited
The radio says it _____ later in the day, then we can go out to play.
#41994
A
stops to rain
B
stops raining
C
will stop raining
D
will stop to rain
—Shall we go out for a walk?—Sorry, I can’t. I _______ my homework.
#42706
A
do
B
did
C
am doing
D
was doing
We____here two hours ago . So we___ _here for two hours .
#39938
A
have arrived , have been
B
have come , have been
C
came , have come
D
arrived , have been