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The company had about 20 notebook computers but only one-thi

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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
The company had about 20 notebook computers but only one-thi
答案D
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.