We have two computers.Still we are going to have__one.Athe third.Ba third 为什么不选A

问题描述:

We have two computers.Still we are going to have__one.Athe third.Ba third 为什么不选A

B
a + 序数词 表示“又一,另一”

B
再买第三个用a third,因为还没买到手呢;如果已经拥有第三个了,就用the third