题目

The company had about 20 notebook computers but only one-third _______ used regularly. Now we have 60 working all day long.（2006浙江）   A. is            B. are           C. was         D. were 答案：D 解析: D考查主谓一致。主语为one-third，但省略了notebook computers，分数的主谓一致依据修饰的名词的数，故答案为D。

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