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
Jeff _______the hospital if he feels better in a few days.
#41513
A
leaves
B
left
C
will leave
D
has left
—Where have you _________ all day? —I came back at noon and I _________ in this room ever since.
#40192
A
gone; had been
B
gone; was
C
been; have been
D
been; am
— Were you at home at that time?— No, I ______ dinner with my friends in a restaurant.
#41654
A
have
B
had
C
will have
D
was having
—Where ____ you ____ lunch? —At home．There was no school lunch
#42770
A
did；have
B
are；having
C
will；have
D
do；have