The old folk of the city is among the first to be evacuated by the five___
问题描述：
The old folk of the city is among the first to be evacuated by the five___
The old folk of the city is among the first to be evacuated by the five ___.
A aircraft.B aircrafts
为什么要选A?不是五架飞机么?
答
单复数相同
an aircraft
two aircraft
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