Every possible means ______ to prevent the air pollution, but the sky is still not clear.
#86302
A
is used
B
are used
C
has been used
D
have been used
推荐题目
Professor Smith, along with his assistants, _____on the Project day and night to meet the deadline.
#85684
A
work
B
working
C
is working
D
are working
A number of students trees every year and the number of them increasing.
#85859
A
plant; is
B
plants; is
C
planting; is
D
planting; are
______Gina ______Tara are studying Chinese history’ and culture now. They find them rich and amazing.
#44182
A
Both； and
B
Not only；but also
C
Either；or
D
Neither；nor
--- Have you got some water to drink?--- Here you are. There _______ still some in the bottle.
#44285
A
are
B
has
C
is
D
have