The class ______ big. Now the class_______ practicing swimming.
#85799
A
are ;are
B
is ;is
C
is ; are
D
are ; is
推荐题目
Four-fifths of the crop ______. 
#85690
A
are ruined
B
was ruined
C
were ruined
D
have been ruined
_____ has been introduced to the students to help them make progress.
#85649
A
Many books as well as advice
B
Some advice as well as many books
C
Not only some advice but also many books
D
Some advice and many books
 Every possible means ______ to prevent the air pollution, but the sky is still not clear. 
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A
has been used 
B
have been used
C
is used 
D
are used