Our school has about 100 computers, but only sixty percent ____ used regularly.
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A
is
B
are
C
was
D
were
推荐题目
There _________ a computer in everyone's house in the future.
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A
will have
B
will has
C
will be
D
is
_____ has been introduced to the students to help them make progress.
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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
The box of rubbers ____ white. 
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A
is 
B
are 
C
be 
D
were