The man as well as his parents ____________ content with the dishes his wife cooks.
#85665
A
have
B
are
C
has
D
is
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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