摘要:第一节 单项选择(共20小题.每小题1分.满分20分) 请根据题意.从21-40各小题所给的A.B.C和D项中.选出最佳选项.并在答题卡上将该项涂黑.21.The company had about 20 notebook computers but only one third used regularly. Now we have sixty working all day long. A.is B.are C.was D.were

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