【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
在线课程【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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