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The company had about 20 notebook computers,but only one-third__________used regularly.
A.is
B.are
C.was
D.were
B.are
C.was
D.were
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参考解析
解析：考情点拨:本题考查时态和主谓一致。应试指导:句意：这家公司大约有20台笔记表电脑，但是只有三分之一经常被使用。一般来讲，分数作主语时．谓语用单数。但是由前半句about it 20 notebook computers可知，此处用复数本句的时态是过去时，因此应该用were。
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