【題目】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】考查單復(fù)數(shù)和時態(tài)，one-third of 20 notebook computers,可知主語是復(fù)數(shù)，有后面的Now可知，前面是過去時態(tài)，所以選D

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