◎ 题干
The company had about 20 notebook computers but only one third ________ used regularly. Now we
have 60 working all day long.
[     ]
A. is  
B. are
C. was  
D. were
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“The company had about 20 notebook computers but only one third ________ used regularly. Now we have 60 working all day long. [ ]A. isB. areC. wasD. were…”主要考查了你对  【一般过去时】【主谓一致】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。