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【题目】The company had about 30 computers but only onethird used regularly.Now we have 60 working all day long.

A. is B. are

C. was D. were

【答案】D

【解析】考查单复数和时态,one-third of 20 notebook computers,可知主语是复数,有后面的Now可知,前面是过去时态,所以选D

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