The company had about 20 notebook computers but only one-third ＿＿＿＿＿＿＿ used regularly. Now we have 60 working all day long._未知科目_远程教育查题网

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题目：The company had about 20 notebook computers but only one-third ＿＿＿＿＿＿＿ used regularly. Now we have 60 working all day long.
- A. is
- B. were
- C. are
- D. was
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