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在线课程D
解析：
本题考查主谓一致及动词的时态，当分数、百分数作主语时，要根据其后面的名词来决定其谓语动词的单复数，此处one-third表示one-third of the notebook computers，因此谓语动词用复数，且句子的时态用了过去时，所以D项正确．
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The company had about 20 notebook computers but only one-third used regularly．Now we have 60 working
编辑：chaxungu时间：2026-04-24 12:54:59分类：高中英语题库
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