Every possible means _____ to prevent the air pollution, but the sky is still not clear.
#85634
A
is used
B
are used
C
has been used
D
have been used
推荐题目
Not only the kids but also the teacher ________. We are worried because time is running out.
#43667
A
has lost
B
has gone missing
C
have lost their way
D
have disappeared
We noticed that each animal and each tree in the park _____ being taken good care of.
#85985
A
are
B
is
C
were
D
was
The number of traffic accidents that _______ in developing countries _______ increasing.
#86033
A
happen; is
B
happens; is
C
happens; are
D
happen; are
The father as well as his three children skating on the frozen river every Sunday afternoon in winter .
#85840
A
go
B
are going
C
goes
D
went