The number of people visiting the exhibition ______ 50, and a number of them ____ painters.
#85600
A
was; was
B
were; was
C
was; were
D
were; were
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Every possible means ________ to prevent the air pollution，but the sky is still not very clear.
#85546
A
were using
B
have used
C
has been used
D
was used
What the science teacher does and says ____ of great importance to college students.
#85989
A
was
B
are
C
is
D
were